Genodermatoses — CUTICON Prelim Quiz Prep

# CUTICON 2026 Punjab Prelim Quiz Practice — 200 Moderate-to-Hard MCQs
## Compiled for departmental practice (Dermatology, Venereology & Leprosy)

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## SECTION 1: GENODERMATOSES (Q1–Q17)

**Q1.** A child presents with multiple facial trichilemmomas, macrocephaly, and oral papillomatosis. Genetic testing reveals a *PTEN* mutation. Which malignancy screening is most critical?
A) Medulloblastoma
B) Breast and thyroid carcinoma
C) Colorectal carcinoma only
D) Retinoblastoma
**Answer: B** — Cowden syndrome (PTEN hamartoma tumor syndrome) carries significantly increased lifetime risk of breast, thyroid (follicular), and endometrial carcinoma; screening protocols target these.

**Q2.** Which genodermatosis is characterized by multiple basal cell carcinomas, odontogenic keratocysts, palmar/plantar pits, and calcification of the falx cerebri?
A) Muir-Torre syndrome
B) Gorlin (nevoid basal cell carcinoma) syndrome
C) Rombo syndrome
D) Bazex-Dupré-Christol syndrome
**Answer: B** — Gorlin syndrome is due to *PTCH1* mutation (Hedgehog pathway); triad of BCCs, jaw cysts, and palmoplantar pits is classic.

**Q3.** A neonate has generalized poikiloderma, photosensitivity, and later develops multiple osteosarcomas. Which gene defect and syndrome fit best?
A) *WRN* – Werner syndrome
B) *RECQL4* – Rothmund-Thomson syndrome
C) *ATM* – Ataxia-telangiectasia
D) *BLM* – Bloom syndrome
**Answer: B** — Rothmund-Thomson syndrome (RECQL4 helicase defect) presents with poikiloderma, photosensitivity, sparse hair, and elevated risk of osteosarcoma.

**Q4.** Mucocutaneous pigmented macules on lips/buccal mucosa combined with hamartomatous intestinal polyps and increased risk of intussusception defines:
A) Gardner syndrome
B) Peutz-Jeghers syndrome
C) Cronkhite-Canada syndrome
D) Cowden syndrome
**Answer: B** — Peutz-Jeghers syndrome (*STK11/LKB1* mutation); perioral pigmented macules plus GI hamartomatous polyposis with intussusception risk.

**Q5.** Which of the following is NOT a feature of ataxia-telangiectasia?
A) Oculocutaneous telangiectasia
B) Progressive cerebellar ataxia
C) Elevated alpha-fetoprotein
D) Corneal vascularization with band keratopathy
**Answer: D** — Band keratopathy is not typical; AT features telangiectasia (bulbar conjunctiva, ears, face), cerebellar ataxia, immunodeficiency, and elevated AFP (*ATM* gene, chromosomal instability).

**Q6.** A young male presents with reticulate skin pigmentation, nail dystrophy, oral leukoplakia, and pancytopenia. Diagnosis and gene category?
A) Dyskeratosis congenita – telomere maintenance genes (e.g., *DKC1*)
B) Netherton syndrome – *SPINK5*
C) Chediak-Higashi syndrome – *LYST*
D) Hermansky-Pudlak syndrome – *HPS1*
**Answer: A** — Dyskeratosis congenita's triad (reticulate pigmentation, nail dystrophy, leukoplakia) plus bone marrow failure results from telomerase/telomere maintenance gene defects.

**Q7.** Focal dermal hypoplasia (Goltz syndrome) is inherited as:
A) Autosomal recessive, *ABCA12*
B) X-linked dominant, *PORCN*
C) Autosomal dominant, *COL7A1*
D) X-linked recessive, *NEMO*
**Answer: B** — Goltz syndrome is X-linked dominant due to *PORCN* mutation; features linear atrophic skin, fat herniation ("papillomas"), skeletal defects, often lethal in males.

**Q8.** Silvery-gray hair, recurrent pyogenic infections, and giant lysosomal granules in leukocytes describe:
A) Griscelli syndrome
B) Chediak-Higashi syndrome
C) Elejalde syndrome
D) Menkes disease
**Answer: B** — Chediak-Higashi syndrome (*LYST* gene) shows giant granules in neutrophils/melanocytes, partial albinism, and recurrent infections with risk of accelerated phase (HLH-like).

**Q9.** Restrictive dermopathy is a lethal neonatal genodermatosis characterized by all EXCEPT:
A) Tight, rigid skin with erosions
B) Micrognathia and small mouth ("fish-mouth")
C) Multiple lentigines and cardiac myxomas
D) Joint contractures (arthrogryposis)
**Answer: C** — Multiple lentigines with cardiac myxomas describes LEOPARD/Carney complex, not restrictive dermopathy (which is due to *LMNA*/*ZMPSTE24* defects affecting lamin processing).

**Q10.** KID syndrome (keratitis-ichthyosis-deafness) is most commonly associated with mutation in which gene?
A) *GJB2* (connexin 26)
B) *GJB6*
C) *TGM1*
D) *ABCA12*
**Answer: A** — KID syndrome results from *GJB2* (connexin 26) mutations causing a gain-of-function gap junction defect; sensorineural deafness, vascularizing keratitis, and erythrokeratoderma.

**Q11.** A patient with acute intermittent porphyria classically presents with all EXCEPT:
A) Abdominal pain
B) Photosensitivity with blistering
C) Neuropsychiatric symptoms
D) Dark/port-wine colored urine
**Answer: B** — AIP is a non-cutaneous porphyria (no photosensitivity) due to porphobilinogen deaminase deficiency; cutaneous photosensitivity is seen in porphyria cutanea tarda, EPP, and variegate porphyria, not AIP.

**Q12.** Porphyria cutanea tarda shows deficiency of which enzyme, and what is the classic Wood's lamp finding in urine?
A) Ferrochelatase; no fluorescence
B) Uroporphyrinogen decarboxylase; coral-pink fluorescence
C) ALA synthase; blue-white fluorescence
D) Porphobilinogen deaminase; green fluorescence
**Answer: B** — PCT is due to uroporphyrinogen decarboxylase (UROD) deficiency; urine shows characteristic coral-pink fluorescence under Wood's lamp.

**Q13.** Ectodermal dysplasia with hypodontia, hypotrichosis, and hypohidrosis, X-linked recessive, is due to mutation in:
A) *EDA* (ectodysplasin A)
B) *WNT10A*
C) *p63*
D) *PVRL1*
**Answer: A** — Hypohidrotic (anhidrotic) ectodermal dysplasia (Christ-Siemens-Touraine syndrome) is classically X-linked recessive due to *EDA* gene mutation.

**Q14.** A neonate with "collodion membrane," ectropion, and later a normal-appearing skin (self-healing) most likely has:
A) Harlequin ichthyosis
B) Self-healing collodion baby (lamellar ichthyosis of the newborn variant)
C) Netherton syndrome
D) Sjögren-Larsson syndrome
**Answer: B** — Self-healing collodion baby represents a phenotype where the collodion membrane sheds and skin becomes clinically normal or near-normal; often associated with transglutaminase-1 mutations with residual enzyme activity.

**Q15.** Which genodermatosis shows a "Blaschko-linear" distribution and is explained by the Lyon hypothesis (X-inactivation mosaicism)?
A) Neurofibromatosis type 1
B) Incontinentia pigmenti
C) Tuberous sclerosis
D) Xeroderma pigmentosum
**Answer: B** — Incontinentia pigmenti (X-linked dominant, *NEMO*) shows Blaschkoid lesions explained by random X-inactivation (functional mosaicism), lethal in most males.

**Q16.** In Muir-Torre syndrome, multiple sebaceous neoplasms and keratoacanthomas occur along with visceral malignancy due to defects in:
A) DNA mismatch repair genes (e.g., *MLH1*, *MSH2*)
B) Nucleotide excision repair genes
C) Base excision repair genes
D) Homologous recombination genes (*BRCA1/2*)
**Answer: A** — Muir-Torre is a variant of Lynch syndrome caused by mismatch repair gene defects, predisposing to colorectal/genitourinary cancers plus sebaceous neoplasms.

**Q17.** Which statement about Xeroderma Pigmentosum variant group (XP-V) is correct?
A) Defective nucleotide excision repair with severe neurological disease
B) Defective DNA polymerase eta, normal NER, milder photosensitivity
C) Defective mismatch repair
D) Defective telomerase
**Answer: B** — XP-V is due to *POLH* (DNA polymerase eta) defect affecting translesion synthesis, not classical NER; typically milder phenotype without early severe neurodegeneration.

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## SECTION 2: PAPULOSQUAMOUS & ECZEMATOUS DISORDERS (Q18–Q34)

**Q18.** A patient has grouped follicular hyperkeratotic papules coalescing into orange-red plaques with islands of sparing ("nappes claires"). Diagnosis?
A) Pityriasis rubra pilaris
B) Psoriasis
C) Lichen planus
D) Pityriasis rosea
**Answer: A** — PRP shows follicular papules, orange-red erythroderma with characteristic islands of sparing (nappes claires) and waxy palmoplantar keratoderma.

**Q19.** Type V (atypical juvenile) pityriasis rubra pilaris is associated with which underlying cause in some recent literature?
A) HIV infection
B) Gain-of-function mutations in *CARD14*
C) *FLG* mutation
D) *IL36RN* mutation
**Answer: B** — Familial PRP (type V) has been linked to *CARD14* gain-of-function mutations, which also cause CARD14-associated papulosquamous eruption (CAPE), overlapping with familial pityriasis rubra pilaris/psoriasis spectrum.

**Q20.** Auspitz sign in psoriasis refers to:
A) Koebnerization at trauma sites
B) Pinpoint bleeding on scale removal
C) Silvery scale on scraping
D) Nail pitting
**Answer: B** — Auspitz sign is pinpoint bleeding points after scale removal, due to dilated tortuous capillaries in elongated dermal papillae reaching close to a thinned suprapapillary epidermis.

**Q21.** The pathogenesis of psoriasis centrally involves which T-cell axis and cytokine?
A) Th2/IL-4
B) Th17/IL-17 and IL-23
C) Th1/IFN-gamma exclusively
D) Treg/IL-10
**Answer: B** — The IL-23/Th17 axis with downstream IL-17A is central to psoriasis pathogenesis, forming the basis for biologic therapy (anti-IL-17, anti-IL-23).

**Q22.** Wickham's striae are pathognomonic surface markings seen in:
A) Lichen planus
B) Lichen sclerosus
C) Lichen nitidus
D) Lichen simplex chronicus
**Answer: A** — Wickham's striae are fine white lines on the surface of violaceous, polygonal, pruritic papules of lichen planus, corresponding to focal hypergranulosis.

**Q23.** Herald patch preceding a generalized eruption in a "Christmas tree" distribution along skin cleavage lines suggests:
A) Guttate psoriasis
B) Pityriasis rosea
C) Secondary syphilis
D) Tinea corporis
**Answer: B** — Pityriasis rosea begins with a herald patch followed by smaller oval lesions along Langer's lines, giving a "Christmas tree" pattern on the back; linked to HHV-6/7 reactivation.

**Q24.** Which histological feature best differentiates lichen planus from lupus erythematosus on direct immunofluorescence?
A) Shaggy fibrinogen deposition at DEJ in LP vs granular IgG/C3 band in LE
B) Linear IgA in LP vs IgM in LE
C) IgG4 deposition in LP
D) No difference exists
**Answer: A** — DIF in LP shows shaggy fibrinogen along the basement membrane zone, while LE shows a granular "lupus band" of IgG, IgM, and C3.

**Q25.** In atopic dermatitis, the primary skin barrier gene most strongly implicated is:
A) *FLG* (filaggrin)
B) *COL7A1*
C) *KRT5*
D) *ABCA12*
**Answer: A** — Loss-of-function filaggrin mutations are the strongest known genetic risk factor for atopic dermatitis due to impaired skin barrier function.

**Q26.** Dennie-Morgan lines, seen in atopic dermatitis, refer to:
A) Hyperlinear palms
B) Infraorbital folds/creases
C) Nuchal thickening
D) White dermatographism
**Answer: B** — Dennie-Morgan folds are extra creases below the lower eyelid, a minor diagnostic feature of atopic dermatitis.

**Q27.** Which patch test allergen is the most common cause of allergic contact dermatitis worldwide?
A) Formaldehyde
B) Nickel sulfate
C) Fragrance mix
D) Paraphenylenediamine
**Answer: B** — Nickel remains the most frequent contact allergen globally, especially in jewelry-related dermatitis.

**Q28.** Seborrheic dermatitis is associated with proliferation of which organism?
A) *Malassezia* species
B) *Trichophyton rubrum*
C) *Candida albicans*
D) *Propionibacterium acnes*
**Answer: A** — Malassezia yeast overgrowth and the resultant inflammatory response are implicated in seborrheic dermatitis pathogenesis.

**Q29.** Guttate psoriasis is classically triggered by:
A) Streptococcal pharyngitis
B) HPV infection
C) EBV infection
D) Drug reaction to beta-blockers
**Answer: A** — Guttate psoriasis frequently follows streptococcal throat infection, especially in children and young adults, via streptococcal superantigen-driven T-cell activation.

**Q30.** Köbner phenomenon is seen in all EXCEPT:
A) Psoriasis
B) Lichen planus
C) Vitiligo
D) Erythema multiforme
**Answer: D** — Köbnerization (new lesions at trauma sites) is typical of psoriasis, lichen planus, vitiligo, and lichen nitidus, but not classically a feature of erythema multiforme.

**Q31.** Nail pitting, oil-drop sign, and onycholysis with distal separation are seen in:
A) Onychomycosis
B) Psoriatic nail disease
C) Lichen planus of nails
D) Alopecia areata nails
**Answer: B** — Psoriatic nail changes include pitting, oil-drop (salmon patch) discoloration, onycholysis, and subungual hyperkeratosis.

**Q32.** Erythrodermic psoriasis carries risk of all EXCEPT:
A) High-output cardiac failure
B) Hypothermia
C) Protein loss and hypoalbuminemia
D) Hypercalcemia
**Answer: D** — Erythrodermic psoriasis risks include thermoregulatory failure, fluid/protein loss, and cardiac strain; hypercalcemia is not a typical feature (unlike some malignancy-associated erythroderma).

**Q33.** Follicular, hypertrophic, and bullous are recognized clinical variants of:
A) Lichen planus
B) Psoriasis
C) Pityriasis rosea
D) Seborrheic dermatitis
**Answer: A** — Lichen planus has multiple clinical variants: actinic, hypertrophic, follicular (lichen planopilaris), bullous, atrophic, and linear.

**Q34.** A drug-induced lichenoid eruption is most classically associated with which drug class?
A) Antimalarials (e.g., hydroxychloroquine)
B) Beta-lactam antibiotics
C) Loop diuretics
D) Statins
**Answer: A** — Antimalarials, along with gold, thiazides, and beta-blockers, are classic causes of lichenoid drug eruptions, which may lack Wickham's striae and show eosinophils on histology.

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## SECTION 3: AUTOIMMUNE & BULLOUS DISORDERS (Q35–Q51)

**Q35.** The target antigen in pemphigus vulgaris is:
A) Desmoglein 1
B) Desmoglein 3 (and Dsg1 in mucocutaneous type)
C) BP180
D) Type VII collagen
**Answer: B** — PV primarily targets desmoglein 3; mucocutaneous PV also has anti-Dsg1 antibodies, while pemphigus foliaceus targets desmoglein 1 alone (superficial blister).

**Q36.** Nikolsky sign positivity indicates blister formation at which histological level in pemphigus vulgaris?
A) Subepidermal
B) Suprabasal, intraepidermal (acantholysis)
C) Subcorneal
D) Dermal-epidermal junction with linear IgA
**Answer: B** — PV shows suprabasal acantholysis ("tombstoning" of basal cells still attached to the basement membrane), correlating with a positive Nikolsky sign.

**Q37.** Direct immunofluorescence in bullous pemphigoid classically shows:
A) Intercellular "chicken-wire" IgG/C3 pattern
B) Linear IgG/C3 deposition along basement membrane zone
C) Granular IgA at dermal papillae tips
D) Shaggy fibrinogen at DEJ
**Answer: B** — BP shows linear deposition of IgG and C3 along the BMZ, targeting BP180 (collagen XVII) and BP230 (hemidesmosomal proteins), producing subepidermal blisters.

**Q38.** Dermatitis herpetiformis is strongly associated with which systemic disease and antibody?
A) Celiac disease; anti-tissue transglutaminase/anti-epidermal transglutaminase
B) Crohn's disease; ANCA
C) SLE; anti-dsDNA
D) Rheumatoid arthritis; anti-CCP
**Answer: A** — DH is the cutaneous manifestation of gluten sensitivity, associated with granular IgA deposits at dermal papillae tips, and antibodies against epidermal (and tissue) transglutaminase.

**Q39.** Linear IgA bullous dermatosis can be drug-induced, most classically by:
A) Vancomycin
B) Metformin
C) Amlodipine
D) Atorvastatin
**Answer: A** — Vancomycin is the classic trigger for drug-induced linear IgA bullous dermatosis, presenting with tense bullae often in an annular/"string of pearls" configuration.

**Q40.** Paraneoplastic pemphigus is most commonly associated with which underlying malignancy?
A) Non-Hodgkin lymphoma/CLL
B) Hepatocellular carcinoma
C) Renal cell carcinoma
D) Prostate carcinoma
**Answer: A** — Paraneoplastic pemphigus is most frequently associated with lymphoproliferative disorders (NHL, CLL, Castleman disease), with severe mucosal involvement and characteristic multiple antibody targets (plakins, desmogleins).

**Q41.** Epidermolysis bullosa acquisita targets which antigen, and how is it distinguished from dystrophic EB?
A) Type VII collagen; distinguished by autoimmune (acquired, DIF-positive) vs genetic basis of dystrophic EB
B) Laminin-332; distinguished by age of onset only
C) BP180; no distinguishing features
D) Desmoglein 3; onset in infancy
**Answer: A** — Both EBA and dystrophic EB target type VII collagen, but EBA is an acquired autoimmune blistering disease (positive DIF/circulating autoantibodies) typically in adults, unlike the inherited COL7A1 mutation in dystrophic EB.

**Q42.** A malar "butterfly" rash sparing the nasolabial folds, photosensitivity, and discoid lesions with scarring alopecia describe:
A) Dermatomyositis
B) Systemic and discoid lupus erythematosus overlap features
C) Rosacea
D) Seborrheic dermatitis
**Answer: B** — The malar rash sparing nasolabial folds is characteristic of acute cutaneous LE, while discoid lesions with scarring alopecia reflect chronic cutaneous (discoid) LE; both can coexist.

**Q43.** Gottron's papules and heliotrope rash with proximal muscle weakness suggest:
A) Dermatomyositis
B) Polymyositis
C) Systemic sclerosis
D) Mixed connective tissue disease
**Answer: A** — Gottron's papules (violaceous papules over knuckles) and heliotrope (periorbital violaceous) rash are pathognomonic cutaneous signs of dermatomyositis.

**Q44.** "Mechanic's hands" (hyperkeratotic, fissured, hyperpigmented palmar/lateral finger skin) is most associated with which myositis-specific antibody?
A) Anti-Jo-1 (antisynthetase syndrome)
B) Anti-Mi-2
C) Anti-TIF1-gamma
D) Anti-NXP2
**Answer: A** — Anti-Jo-1 antibody-positive antisynthetase syndrome classically shows mechanic's hands, interstitial lung disease, and myositis.

**Q45.** Localized scleroderma (morphea) differs from systemic sclerosis primarily by:
A) Absence of Raynaud's phenomenon and internal organ involvement
B) Presence of anti-Scl-70 antibody
C) Sclerodactyly with digital ulcers
D) Pulmonary hypertension
**Answer: A** — Morphea is limited to skin/subcutaneous tissue without Raynaud's, sclerodactyly, or visceral involvement, distinguishing it from systemic sclerosis.

**Q46.** Which autoantibody is most specific for limited cutaneous systemic sclerosis (CREST syndrome)?
A) Anti-centromere antibody
B) Anti-Scl-70 (topoisomerase I)
C) Anti-RNA polymerase III
D) Anti-Ro/La
**Answer: A** — Anti-centromere antibodies are associated with limited cutaneous SSc (CREST), while anti-Scl-70 is linked with diffuse cutaneous SSc and pulmonary fibrosis; anti-RNA pol III correlates with renal crisis risk.

**Q47.** In bullous pemphigoid, eosinophilic spongiosis on histology, along with what clinical sign, may precede frank bullae formation?
A) Urticarial/eczematous prodromal plaques
B) Herald patch
C) Target lesions
D) Dusky purpuric macules only
**Answer: A** — BP frequently has a non-bullous prodromal phase with urticarial or eczematous pruritic plaques before tense bullae develop.

**Q48.** Which finding differentiates dermatitis herpetiformis from linear IgA disease on DIF?
A) DH shows granular IgA at dermal papillae tips; LABD shows linear IgA along BMZ
B) DH shows linear IgG; LABD shows granular IgA
C) No difference; both are identical
D) DH shows IgM only
**Answer: A** — This granular vs linear IgA distribution is the key immunopathological differentiator between DH and linear IgA bullous dermatosis.

**Q49.** Chronic bullous disease of childhood is a pediatric variant of:
A) Bullous pemphigoid
B) Linear IgA bullous dermatosis
C) Dermatitis herpetiformis
D) Pemphigus foliaceus
**Answer: B** — Chronic bullous disease of childhood represents the pediatric form of linear IgA bullous dermatosis, often with an annular "cluster of jewels" blister pattern around eroded lesions.

**Q50.** Anti-p200 pemphigoid targets which antigen?
A) Laminin gamma-1 (laminin-332 component distinct from BP180/230)
B) Desmoplakin
C) Envoplakin
D) Periplakin
**Answer: A** — Anti-p200 pemphigoid is a subepidermal bullous disease targeting a 200 kDa protein in the lower lamina lucida (laminin gamma-1), clinically resembling BP but with distinct antigen.

**Q51.** In systemic lupus erythematosus, which cutaneous finding correlates with disease activity and is included in SLEDAI scoring?
A) Malar rash
B) Discoid lesions
C) Livedo reticularis
D) Raynaud's phenomenon
**Answer: A** — Acute malar rash is one of the mucocutaneous items included in SLEDAI activity scoring, reflecting active disease, unlike chronic discoid lesions which may persist independent of systemic activity.

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## SECTION 4: PIGMENTARY DISORDERS (Q52–Q67)

**Q52.** The primary immunological mechanism of melanocyte destruction in vitiligo is:
A) Autoantibody-mediated complement lysis
B) CD8+ cytotoxic T-cell mediated melanocyte destruction
C) Eosinophil degranulation
D) Mast cell-mediated
**Answer: B** — Vitiligo pathogenesis centers on autoreactive CD8+ T cells targeting melanocyte antigens, with IFN-gamma/CXCL9-10 signaling amplifying the immune attack.

**Q53.** Segmental vitiligo differs from generalized vitiligo in that it:
A) Follows a dermatomal/Blaschkoid distribution, often stable, and responds better to surgical therapy
B) Always has thyroid autoimmunity
C) Is associated with halo nevi exclusively
D) Never occurs in children
**Answer: A** — Segmental vitiligo has a unilateral, non-dermatomal but Blaschko-like distribution, tends to stabilize early, and often responds well to melanocyte transplantation procedures.

**Q54.** Koebner phenomenon in vitiligo and leukotrichia within a patch both suggest:
A) Poor prognosis for repigmentation
B) Excellent prognosis
C) Active infection
D) Drug-induced etiology
**Answer: A** — Leukotrichia (white hair within a vitiligo patch) indicates destruction of the hair follicle melanocyte reservoir, predicting poor response to repigmentation therapy.

**Q55.** Melasma is characteristically distributed on all EXCEPT:
A) Malar region
B) Mandibular region
C) Centrofacial region
D) Dorsal forearms
**Answer: D** — Melasma classically affects centrofacial, malar, and mandibular facial patterns; dorsal forearm melasma is a less common, distinct variant, not one of the "classic" three patterns.

**Q56.** Pigmentary demarcation lines are best explained by:
A) Post-inflammatory change
B) Normal variant marking transition zones of differing melanocyte density (mosaicism)
C) Vitiligo variant
D) Chemical leukoderma
**Answer: B** — PDLs (Futcher/Voigt lines etc.) are physiological, more prominent in darker skin, representing boundaries between areas of differing pigmentation due to developmental mosaicism.

**Q57.** Diffuse hyperpigmentation with mucosal pigmentation (buccal mucosa, palmar creases) and hypotension should raise suspicion for:
A) Cushing syndrome
B) Addison's disease
C) Hemochromatosis
D) Acanthosis nigricans
**Answer: B** — Primary adrenal insufficiency causes elevated ACTH/MSH-related peptides, producing diffuse and mucosal hyperpigmentation, accompanied by hypotension and electrolyte disturbance.

**Q58.** Post-inflammatory hyperpigmentation is more pronounced and persistent in which Fitzpatrick skin types?
A) I–II
B) III–VI
C) Equal across all types
D) Only type I
**Answer: B** — Darker skin types (III–VI) have more reactive melanocytes and thus more pronounced, longer-lasting PIH after inflammatory insults.

**Q59.** Nevus of Ota involves pigmentation in which distribution?
A) Distribution of ophthalmic and maxillary divisions of trigeminal nerve (periorbital, malar, forehead) with possible scleral involvement
B) Deltoid/acromial region
C) Lumbosacral area
D) Bilateral symmetric facial patches only
**Answer: A** — Nevus of Ota (oculodermal melanocytosis) affects skin in the V1/V2 trigeminal distribution and often the sclera/conjunctiva, carrying slight risk of uveal melanoma.

**Q60.** Nevus of Ito differs from nevus of Ota by location in the:
A) Supraclavicular and deltoid/scapular region
B) Malar region
C) Perioral region
D) Sacral region
**Answer: A** — Nevus of Ito shows dermal melanocytosis in the shoulder/supraclavicular/deltoid region rather than the face.

**Q61.** The final hyperpigmented "whorled/streaky" stage of incontinentia pigmenti is caused histologically by:
A) Active melanocyte proliferation
B) Incontinence of melanin into the dermis with dermal melanophages
C) New melanocyte migration defect
D) Post-inflammatory basal layer regeneration
**Answer: B** — The name "incontinentia pigmenti" derives from pigment "incontinence" — melanin dropping from a damaged basal layer into the dermis, taken up by melanophages, producing the characteristic streaky hyperpigmentation.

**Q62.** Riehl's melanosis (pigmented contact dermatitis) is most often triggered by:
A) Fragrances and dyes in cosmetics
B) UV exposure alone
C) Systemic drugs
D) Hormonal changes
**Answer: A** — Riehl's melanosis results from a lichenoid contact reaction to allergens in cosmetics/fragrances, producing reticulate facial hyperpigmentation.

**Q63.** Chemical leukoderma is distinguished histologically/clinically from vitiligo by:
A) Complete melanocyte absence identical to vitiligo
B) Confetti-like depigmentation with perilesional hyperpigmentation and history of occupational/cosmetic phenol/hydroquinone exposure
C) Segmental distribution
D) Association with autoimmune thyroiditis
**Answer: B** — Chemical/occupational leukoderma (e.g., from phenolic/catecholic compounds like tert-butylphenol in rubber/adhesives) often shows confetti macules with perilesional hyperpigmented halo, and improves partially on avoidance.

**Q64.** Halo nevus formation is thought to represent an immune reaction against:
A) Shared melanocytic antigens between the nevus and surrounding normal melanocytes
B) HPV antigens
C) Bacterial superantigens
D) Fungal antigens
**Answer: A** — Halo nevus depigmentation reflects a T-cell mediated immune response against melanocyte antigens shared by the nevus and adjacent normal skin, sometimes preceding vitiligo.

**Q65.** Confetti-like hypopigmented macules are a minor diagnostic criterion for which genodermatosis (distinct from vitiligo confetti macules)?
A) Tuberous sclerosis complex
B) Neurofibromatosis type 1
C) Piebaldism
D) Waardenburg syndrome
**Answer: A** — "Confetti" skin lesions are a recognized minor diagnostic criterion in the 2012 revised TSC diagnostic criteria.

**Q66.** Piebaldism is inherited in what pattern and due to mutation in which gene?
A) Autosomal dominant; *KIT* proto-oncogene
B) Autosomal recessive; *TYR*
C) X-linked; *OCA2*
D) Autosomal dominant; *MITF*
**Answer: A** — Piebaldism is autosomal dominant, caused by *KIT* mutations affecting melanoblast migration/differentiation, producing stable patches of leukoderma typically with a white forelock.

**Q67.** Vitiligo associated with polyglandular autoimmune syndrome most commonly coexists with which endocrinopathy?
A) Autoimmune thyroid disease (Hashimoto's/Graves')
B) Type 2 diabetes mellitus
C) Cushing syndrome
D) Acromegaly
**Answer: A** — Vitiligo has the strongest documented association with autoimmune thyroid disease among endocrinopathies, warranting thyroid function screening.

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## SECTION 5: HAIR & NAIL DISORDERS (Q68–Q83)

**Q68.** "Exclamation mark" hairs seen at the periphery of a bald patch are characteristic of:
A) Alopecia areata
B) Trichotillomania
C) Tinea capitis
D) Androgenetic alopecia
**Answer: A** — Exclamation mark hairs (broken, tapering proximally) at the margin of expanding patches are a hallmark trichoscopic/clinical sign of active alopecia areata.

**Q69.** Which trichoscopic sign helps distinguish trichotillomania from alopecia areata?
A) Flame hairs, V-sign, tulip hairs, and hair powder
B) Yellow dots
C) Black dots exclusively
D) Exclamation mark hairs
**Answer: A** — Trichotillomania trichoscopy shows flame hairs, V-sign, tulip hairs, coiled hairs, and hair powder due to mechanical hair fracture, differing from the yellow dots/exclamation marks of alopecia areata.

**Q70.** Androgenetic alopecia pathogenesis centers on conversion of testosterone to dihydrotestosterone via which enzyme, acting on genetically susceptible follicles?
A) Aromatase
B) 5-alpha reductase type II
C) 17-beta-hydroxysteroid dehydrogenase
D) 21-hydroxylase
**Answer: B** — 5-alpha reductase type II converts testosterone to DHT, which binds androgen receptors in susceptible frontal/vertex follicles causing progressive miniaturization.

**Q71.** Telogen effluvium typically occurs how many weeks after the triggering stressful event (e.g., fever, childbirth, surgery)?
A) 1–2 weeks
B) 6–16 weeks (average ~3 months)
C) 6 months to 1 year
D) Immediately, within 24–48 hours
**Answer: B** — Telogen effluvium classically manifests 6–16 weeks after the precipitating insult, as follicles synchronously shift from anagen to telogen and are shed.

**Q72.** Anagen effluvium, causing abrupt diffuse hair loss within days, is most classically caused by:
A) Chemotherapy (antimitotic agents)
B) Iron deficiency
C) Postpartum hormonal change
D) Chronic telogen effluvium
**Answer: A** — Cytotoxic chemotherapy abruptly arrests the highly mitotic anagen hair matrix, causing rapid, severe hair shedding within 1-4 weeks of treatment.

**Q73.** Frontal fibrosing alopecia is now considered a clinical variant of:
A) Lichen planopilaris
B) Discoid lupus erythematosus
C) Alopecia areata
D) Central centrifugal cicatricial alopecia
**Answer: A** — FFA is regarded as a variant of lichen planopilaris affecting the frontotemporal hairline, with perifollicular erythema/scaling and "lonely hair sign" on trichoscopy.

**Q74.** Central centrifugal cicatricial alopecia (CCCA) predominantly affects which population and is historically linked to which practice?
A) Women of African descent; traction/chemical relaxer use (though causation is debated)
B) Caucasian men; androgenetic pattern
C) Children; tinea capitis
D) Elderly men; seborrheic dermatitis
**Answer: A** — CCCA predominantly affects women of African descent, starting at the vertex/crown, historically linked (though not proven causal) to hair grooming practices including relaxers and heat/traction.

**Q75.** "Black dot" sign on the scalp in a child with patchy alopecia and scaling most suggests:
A) Tinea capitis (endothrix infection, e.g., *T. tonsurans*)
B) Alopecia areata
C) Trichotillomania
D) Androgenetic alopecia
**Answer: A** — Black dots represent hairs broken at the scalp surface due to endothrix fungal invasion weakening the shaft, classic for tinea capitis (especially *Trichophyton tonsurans*).

**Q76.** Beau's lines (transverse grooves across the nail plate) result from:
A) Temporary arrest of nail matrix activity due to systemic illness/stress
B) Chronic paronychia
C) Onychomycosis
D) Psoriasis exclusively
**Answer: A** — Beau's lines reflect transient interruption of nail matrix growth from any severe systemic insult (fever, illness, chemotherapy, trauma), and their position on the nail can help date the event.

**Q77.** Spoon-shaped nails (koilonychia) are classically associated with:
A) Iron deficiency anemia
B) Vitamin B12 deficiency
C) Hyperthyroidism
D) Zinc toxicity
**Answer: A** — Koilonychia is a classic sign of chronic iron deficiency anemia, though it can also be seen in hemochromatosis and occupational trauma.

**Q78.** Digital clubbing is associated with all EXCEPT:
A) Bronchogenic carcinoma
B) Cyanotic congenital heart disease
C) Iron deficiency anemia
D) Inflammatory bowel disease
**Answer: C** — Clubbing is linked to pulmonary malignancy, cyanotic heart disease, and IBD (among others) but is not a recognized feature of iron deficiency anemia (which instead causes koilonychia).

**Q79.** Onychomycosis diagnosis is best confirmed by which combination of tests?
A) KOH microscopy plus fungal culture/PAS histology of nail clippings
B) Wood's lamp examination alone
C) Tzanck smear
D) Skin biopsy with H&E only
**Answer: A** — KOH mount for hyphae combined with culture (species identification) or PAS staining of nail clippings is the standard confirmatory approach for onychomycosis.

**Q80.** Yellow nail syndrome triad includes:
A) Yellow discolored slow-growing nails, lymphedema, and pleural effusion/respiratory disease
B) Yellow nails, alopecia, and vitiligo
C) Yellow nails, clubbing, and cyanosis
D) Yellow nails, psoriasis, and arthritis
**Answer: A** — Yellow nail syndrome features thickened yellow nails with slowed growth, lymphedema, and respiratory tract involvement (pleural effusions, bronchiectasis, chronic sinusitis).

**Q81.** Longitudinal melanonychia with Hutchinson's sign (pigment extension onto proximal/lateral nail fold) raises concern for:
A) Subungual melanoma
B) Onychomycosis
C) Subungual hematoma
D) Nail lichen planus
**Answer: A** — Hutchinson's sign (periungual pigment extension) is a worrying feature suggestive of subungual melanoma and warrants biopsy.

**Q82.** Trachyonychia ("twenty-nail dystrophy") with rough, sandpaper-like nails is most commonly associated with which underlying condition in children?
A) Alopecia areata or lichen planus
B) Psoriasis exclusively
C) Onychomycosis
D) Darier disease
**Answer: A** — Trachyonychia is most frequently idiopathic or associated with alopecia areata and lichen planus in the pediatric population.

**Q83.** Which drug is most classically implicated in causing diffuse non-scarring hair loss (telogen effluvium pattern) as a common adverse effect?
A) Heparin/warfarin (anticoagulants), retinoids, beta-blockers
B) Metformin
C) Amoxicillin
D) Paracetamol
**Answer: A** — Anticoagulants, retinoids, beta-blockers, and antithyroid drugs are well-documented causes of drug-induced telogen effluvium.

---

## SECTION 6: DERMATOPATHOLOGY (Q84–Q100)

**Q84.** Which special stain highlights fungal elements by reacting with polysaccharides in the cell wall?
A) Congo red
B) Periodic acid-Schiff (PAS)
C) Fontana-Masson
D) Verhoeff-Van Gieson
**Answer: B** — PAS stain (with diastase digestion control) highlights fungal cell walls (magenta/pink) and is the workhorse stain for identifying dermatophytes/yeasts in tissue.

**Q85.** Congo red staining with apple-green birefringence under polarized light confirms deposition of:
A) Mucin
B) Amyloid
C) Melanin
D) Hemosiderin
**Answer: B** — Congo red with characteristic apple-green birefringence under polarized light is the gold standard histochemical confirmation of amyloid deposits.

**Q86.** Fontana-Masson stain is used primarily to demonstrate:
A) Elastic fibers
B) Melanin pigment
C) Mast cell granules
D) Collagen bundles
**Answer: B** — Fontana-Masson silver stain specifically highlights melanin, useful in distinguishing melanin from hemosiderin or other pigments in ambiguous cases.

**Q87.** Verhoeff-Van Gieson stain is primarily used to demonstrate which structure, relevant in conditions like pseudoxanthoma elasticum?
A) Elastic fibers (black) against collagen (red) background
B) Reticulin fibers
C) Fungal hyphae
D) Mucopolysaccharides
**Answer: A** — VVG stains elastic fibers black and collagen red/pink, useful for evaluating elastic tissue disorders such as PXE (fragmented, calcified elastic fibers in mid-dermis) and anetoderma (elastic fiber loss).

**Q88.** "Palisading" histiocytes around a central zone of degenerated collagen with mucin deposition describes:
A) Granuloma annulare
B) Sarcoidosis
C) Necrobiosis lipoidica
D) Rheumatoid nodule
**Answer: A** — Granuloma annulare shows necrobiotic (degenerated) collagen surrounded by palisading histiocytes, with abundant interstitial mucin (unlike necrobiosis lipoidica, which has layered granulomas with less mucin and more lipid/plasma cells).

**Q89.** "Naked" (non-caseating) epithelioid granulomas with minimal surrounding lymphocytic cuff are classic for:
A) Sarcoidosis
B) Tuberculosis
C) Foreign body granuloma
D) Granuloma annulare
**Answer: A** — Sarcoidal granulomas are described as "naked" — well-formed epithelioid granulomas with scant peripheral lymphocytes, unlike the dense lymphocytic cuffing of tuberculoid granulomas.

**Q90.** Necrobiosis lipoidica histology, in contrast to granuloma annulare, characteristically shows:
A) Layered ("tiered") palisaded granulomas involving the full dermis with abundant plasma cells and reduced mucin
B) Abundant interstitial mucin only
C) Caseation necrosis
D) Eosinophilic microabscesses
**Answer: A** — NL shows a "layer-cake" pattern of alternating necrobiotic collagen and inflammatory infiltrate (including plasma cells) spanning the full dermis, with less mucin than granuloma annulare.

**Q91.** Pautrier microabscesses (clusters of atypical lymphocytes within the epidermis) are characteristic of:
A) Mycosis fungoides
B) Psoriasis
C) Pemphigus vulgaris
D) Lichen planus
**Answer: A** — Pautrier microabscesses represent intraepidermal collections of neoplastic (atypical, hyperconvoluted) T-lymphocytes, a classic though not always present finding in mycosis fungoides.

**Q92.** The Breslow thickness in melanoma is measured from:
A) The stratum corneum to the deepest point of tumor invasion
B) The granular layer to the base of the tumor
C) The basement membrane to the tumor base only
D) The surface ulceration point only
**Answer: A** — Breslow depth is measured vertically from the top of the granular layer (or ulcer base if ulcerated) to the deepest invasive tumor cell, a critical melanoma staging/prognostic parameter.

**Q93.** Which histological pattern of basal cell carcinoma carries the highest risk of aggressive/infiltrative behavior and recurrence?
A) Nodular
B) Superficial
C) Morpheaform/infiltrative
D) Pigmented
**Answer: C** — Morpheaform (sclerosing/infiltrative) BCC shows thin strands infiltrating a dense fibrous stroma with less distinct margins, correlating with higher recurrence rates and need for wider excision or Mohs surgery.

**Q94.** Keratin pearls and prominent intercellular bridges/desmosomes on histology are characteristic features of:
A) Squamous cell carcinoma
B) Basal cell carcinoma
C) Merkel cell carcinoma
D) Dermatofibrosarcoma protuberans
**Answer: A** — Well-differentiated SCC shows keratin pearls (concentric keratinization) and prominent desmosomal intercellular bridges reflecting squamous differentiation.

**Q95.** A "Grenz zone" refers to:
A) A zone of normal-appearing papillary dermis separating an inflammatory infiltrate from the overlying epidermis
B) The zone of granulomatous inflammation only
C) A necrotic zone in vasculitis
D) The subcutaneous fat plane
**Answer: A** — The Grenz zone is a band of uninvolved papillary dermis between the epidermis and a dermal infiltrate, classically seen in granuloma faciale, leprosy (lepromatous), and some lymphomas/leukemia cutis.

**Q96.** Storiform ("cartwheel") pattern of spindle cells infiltrating the subcutaneous fat in a honeycomb pattern is characteristic of:
A) Dermatofibrosarcoma protuberans
B) Dermatofibroma
C) Kaposi sarcoma
D) Atypical fibroxanthoma
**Answer: A** — DFSP shows a storiform/cartwheel arrangement of monomorphic spindle cells with characteristic honeycombing infiltration into subcutaneous fat; CD34 positive on immunohistochemistry.

**Q97.** In lepromatous leprosy, the histological hallmark cell containing mycobacteria within a foamy cytoplasm is called:
A) Virchow (lepra) cell
B) Touton giant cell
C) Langhans giant cell
D) Reed-Sternberg cell
**Answer: A** — Virchow cells (lepra cells) are macrophages with foamy/vacuolated cytoplasm packed with *M. leprae* bacilli, characteristic of lepromatous leprosy.

**Q98.** Which immunohistochemical marker is most useful to confirm Merkel cell carcinoma?
A) CK20 with characteristic perinuclear dot-like positivity
B) S100
C) Desmin
D) CD34
**Answer: A** — Merkel cell carcinoma shows characteristic perinuclear dot-like CK20 positivity, along with neuroendocrine markers (chromogranin, synaptophysin), helping distinguish it from small cell lung cancer metastasis (TTF-1 negative in MCC).

**Q99.** Eosinophilic spongiosis on histopathology is most typically seen in the early/urticarial stage of:
A) Pemphigus vulgaris
B) Bullous pemphigoid
C) Lichen planus
D) Psoriasis
**Answer: B** — Eosinophilic spongiosis (eosinophils within the epidermis with intercellular edema) is characteristic of the pre-bullous/urticarial phase of bullous pemphigoid.

**Q100.** "Flame figures" — eosinophil-coated collagen fibers — are a histological hallmark of:
A) Wells syndrome (eosinophilic cellulitis)
B) Sweet syndrome
C) Erythema nodosum
D) Granuloma annulare
**Answer: A** — Flame figures (degenerated collagen coated with eosinophilic granule material) are the histological hallmark of Wells syndrome, though they can occasionally be seen in other eosinophil-rich dermatoses.

---

## SECTION 7: INFECTIONS & INFESTATIONS (Q101–Q117)

**Q101.** *Trichophyton indotineae*, driving the current recalcitrant tinea epidemic in India, is characterized by:
A) High-level terbinafine resistance due to squalene epoxidase (*SQLE*) gene mutations
B) Universal azole resistance only
C) Being a novel dermatophyte unrelated to *T. mentagrophytes/interdigitale* complex
D) Exclusive susceptibility to griseofulvin
**Answer: A** — *T. indotineae* (reclassified from the *T. mentagrophytes/interdigitale* complex) shows point mutations in *SQLE* conferring terbinafine resistance, driving widespread treatment failure across India.

**Q102.** In recalcitrant dermatophytosis, which oral antifungal is now frequently preferred as an alternative when terbinafine fails?
A) Itraconazole (with attention to dosing/pharmacokinetics)
B) Fluconazole low-dose weekly only
C) Nystatin
D) Amphotericin B
**Answer: A** — Itraconazole is commonly used as a second-line/alternative agent in terbinafine-resistant dermatophytosis, though relapse and resistance are increasingly reported; combination and longer regimens are being studied.

**Q103.** Tinea incognito refers to:
A) Dermatophyte infection modified/masked by inappropriate topical corticosteroid use
B) Subclinical carrier state
C) Infection confined to nails only
D) A dermatophytid reaction
**Answer: A** — Tinea incognito describes an atypical presentation of dermatophytosis due to misuse of topical steroids, which suppress inflammation while allowing fungal proliferation, obscuring the classic annular scaling border.

**Q104.** Chromoblastomycosis histology characteristically shows:
A) Sclerotic (Medlar) bodies — golden-brown, thick-walled, septate fungal cells
B) Grains with sulfur granules
C) Spherules with endospores
D) Broad-based budding yeast
**Answer: A** — Chromoblastomycosis shows pathognomonic copper/golden-brown, thick-walled, septate "sclerotic" or Medlar bodies within giant cells/abscesses.

**Q105.** Mycetoma is characterized by the triad of:
A) Tumefaction, sinus tracts, and discharge containing grains
B) Vesicles, pustules, and crusting
C) Nodules, ulceration, and lymphadenopathy only
D) Erythema, scaling, and pruritus
**Answer: A** — The classic mycetoma triad is subcutaneous swelling/tumefaction, multiple sinus tracts, and discharge containing characteristic grains (actinomycotic or eumycotic), most commonly affecting the foot ("Madura foot").

**Q106.** Sporotrichosis, caused by *Sporothrix schenckii*, classically presents with:
A) Lymphocutaneous spread along lymphatics from an inoculation site (often after gardening/thorn injury)
B) Diffuse maculopapular rash
C) Solely pulmonary disease
D) Erythema migrans
**Answer: A** — Sporotrichosis ("rose gardener's disease") shows nodular lymphangitic spread proximally from a primary inoculation lesion, typically after trauma from thorns/plant material/soil.

**Q107.** Molluscum contagiosum in an adult with extensive facial lesions should raise suspicion for:
A) Underlying HIV/immunosuppression
B) Atopic dermatitis
C) Psoriasis
D) Contact dermatitis
**Answer: A** — Widespread or atypical (giant/facial) molluscum contagiosum in adults is a marker of underlying immunosuppression, particularly advanced HIV disease.

**Q108.** Herpes zoster ophthalmicus with vesicles on the tip of the nose (Hutchinson's sign) predicts:
A) Higher risk of ocular complications due to nasociliary nerve involvement
B) No clinical significance
C) Disseminated zoster only
D) Post-herpetic neuralgia exclusively
**Answer: A** — Hutchinson's sign (nasal tip vesicles) indicates nasociliary nerve involvement and correlates with a significantly increased risk of ocular complications in herpes zoster ophthalmicus.

**Q109.** Ramsay Hunt syndrome results from reactivation of VZV in which ganglion, producing which triad?
A) Geniculate ganglion — facial palsy, ear vesicles, and hearing/vestibular disturbance
B) Trigeminal ganglion — facial pain and corneal vesicles
C) Dorsal root ganglion — dermatomal rash and myalgia
D) Gasserian ganglion — ophthalmic zoster
**Answer: A** — Ramsay Hunt syndrome (herpes zoster oticus) results from geniculate ganglion reactivation, causing the triad of facial nerve palsy, ear canal/pinna vesicles, and auditory/vestibular symptoms.

**Q110.** Erysipelas is classically distinguished from cellulitis by:
A) Involvement limited to superficial dermis/lymphatics with sharply demarcated, raised borders
B) Involvement of subcutaneous fat with poorly defined margins
C) Necrosis and crepitus
D) Chronic indolent course
**Answer: A** — Erysipelas involves the superficial dermis and lymphatics, presenting with sharply demarcated, raised, erythematous plaques, typically caused by *Streptococcus pyogenes*, unlike deeper, less well-defined cellulitis.

**Q111.** Necrotizing fasciitis is most reliably suggested clinically by:
A) Pain out of proportion to visible skin findings, rapid progression, and systemic toxicity
B) Mild localized erythema without pain
C) Slow indolent progression over weeks
D) Absence of fever
**Answer: A** — Severe pain disproportionate to cutaneous findings, rapid spread, hemorrhagic bullae, crepitus, and systemic toxicity are red flags for necrotizing fasciitis requiring emergency surgical debridement.

**Q112.** Crusted (Norwegian) scabies is associated with which patient population and feature?
A) Immunocompromised/neurologically impaired patients; massive mite burden and hyperkeratotic crusts, highly contagious
B) Healthy children; minimal mite burden
C) Only geriatric patients without immunosuppression
D) Patients with excellent hygiene
**Answer: A** — Crusted scabies occurs in immunosuppressed, neurologically impaired, or institutionalized patients unable to mount an adequate itch/scratch response, resulting in massive mite loads and high contagiousness.

**Q113.** Cutaneous larva migrans, presenting as serpiginous migrating tracks on the foot, is most commonly caused by:
A) *Ancylostoma braziliense* (dog/cat hookworm larvae)
B) *Strongyloides stercoralis*
C) *Onchocerca volvulus*
D) *Wuchereria bancrofti*
**Answer: A** — CLM is classically caused by dog/cat hookworm larvae (*Ancylostoma braziliense*) penetrating skin (often on beaches with contaminated sand), producing pruritic, serpiginous, migrating tracks.

**Q114.** Cutaneous leishmaniasis in India is predominantly caused by which species, and transmitted by which vector?
A) *Leishmania tropica*/*L. donovani* complex via sandfly (*Phlebotomus*) bite
B) *Leishmania braziliensis* via Simulium fly
C) *Leishmania major* via tsetse fly
D) *Leishmania mexicana* via mosquito
**Answer: A** — Indian cutaneous leishmaniasis is linked to *L. tropica*/*L. donovani* complex organisms transmitted by female *Phlebotomus* sandflies.

**Q115.** Which feature helps differentiate scabies from other pruritic dermatoses on dermoscopy?
A) "Delta wing jet with contrail" sign representing the mite and its burrow
B) Yellow dots
C) Comma hairs
D) Corkscrew hairs
**Answer: A** — Dermoscopy of scabies burrows shows the classic "delta-wing jet with contrail" appearance, corresponding to the visualized mite (triangular pigmented structure) at the end of its burrow trail.

**Q116.** Pediculosis capitis nits are most firmly attached to which part of the hair shaft, distinguishing them from hair casts/debris?
A) Close to the scalp, cemented firmly and difficult to remove
B) Distal hair shaft, loosely attached
C) Randomly distributed and easily brushed off
D) Only on eyelashes
**Answer: A** — Head lice nits are firmly cemented to the hair shaft close to the scalp (unlike easily removable hair casts or dandruff), an important clinical differentiator.

**Q117.** Herpes zoster in a dermatomal distribution in a young, otherwise healthy adult without clear precipitant should still prompt consideration of:
A) Underlying immunosuppression (e.g., HIV screening) especially if multidermatomal or recurrent
B) No further workup ever required
C) Autoimmune disease exclusively
D) Diabetes only
**Answer: A** — While zoster can occur in immunocompetent individuals (especially with age), multidermatomal, recurrent, or atypical presentations in younger patients warrant screening for underlying immunosuppression including HIV.

---

## SECTION 8: STIs / VENEREOLOGY (Q118–Q133)

**Q118.** A solitary, painless, indurated genital ulcer with a clean base appearing ~3 weeks post-exposure suggests:
A) Primary syphilis (chancre)
B) Chancroid
C) Genital herpes
D) Lymphogranuloma venereum
**Answer: A** — Primary syphilis presents as a solitary, painless, indurated chancre with a clean base, typically appearing 2-3 weeks after exposure (incubation ~9-90 days).

**Q119.** Which serological test is used to confirm a positive non-treponemal screening test (VDRL/RPR) in syphilis, since these can give false positives?
A) TPHA or FTA-ABS (treponemal-specific tests)
B) Repeat VDRL only
C) Gram stain of ulcer exudate
D) Dark-field microscopy of blood
**Answer: A** — Treponemal-specific tests like TPHA/FTA-ABS/TPPA confirm true syphilis infection after a positive non-specific screening test, as VDRL/RPR can show biological false positives (e.g., in SLE, pregnancy, malaria).

**Q120.** Painful genital ulcers with ragged, undermined edges and a "school of fish" pattern on Gram stain suggest:
A) Chancroid (*Haemophilus ducreyi*)
B) Primary syphilis
C) Donovanosis
D) Herpes genitalis
**Answer: A** — Chancroid presents with painful ulcers with undermined, ragged borders; Gram stain classically shows Gram-negative coccobacilli arranged in a "school of fish" pattern.

**Q121.** Lymphogranuloma venereum, caused by *Chlamydia trachomatis* serovars L1-L3, classically produces which sign in the inguinal stage?
A) "Groove sign" — enlarged, matted inguinal and femoral nodes separated by the inguinal ligament
B) Punched-out painless ulcer
C) Cauliflower-like growth
D) Vesicular cluster
**Answer: A** — The groove sign of Greenblatt refers to grooving between separately enlarged inguinal and femoral lymph node groups, seen in LGV due to lymphatic drainage above and below the inguinal ligament.

**Q122.** Donovanosis (granuloma inguinale) is caused by which organism and shows what characteristic finding on tissue smear?
A) *Klebsiella granulomatis*; intracytoplasmic Donovan bodies in mononuclear cells
B) *Haemophilus ducreyi*; coccobacilli
C) *Treponema pallidum*; spirochetes
D) *Chlamydia trachomatis*; inclusion bodies
**Answer: A** — Donovanosis is caused by *Klebsiella granulomatis* (formerly *Calymmatobacterium granulomatis*); tissue smears show characteristic intracytoplasmic Donovan bodies (safety-pin appearance) within large mononuclear cells.

**Q123.** Secondary syphilis characteristically presents with a rash that notably involves:
A) Palms and soles (bilateral, symmetric, coppery-red maculopapular)
B) Face only, sparing trunk
C) Flexural areas exclusively
D) Mucosal surfaces only, sparing skin
**Answer: A** — The palmoplantar involvement of secondary syphilis's symmetric coppery maculopapular rash is a classic diagnostic clue distinguishing it from other exanthems.

**Q124.** Condylomata lata (secondary syphilis) must be differentiated from condylomata acuminata (genital warts) primarily by:
A) Condylomata lata are flat, moist, broad-based papules teeming with spirochetes; condylomata acuminata are HPV-induced verrucous, cauliflower-like growths
B) Both have identical histology
C) Condylomata lata are pedunculated
D) Condylomata acuminata are always painful
**Answer: A** — Condylomata lata (syphilitic, highly infectious flat papules) differ clinically and etiologically from HPV-driven condylomata acuminata (warty, papillomatous growths).

**Q125.** Which stage of syphilis is characterized by gumma formation, cardiovascular involvement, and neurosyphilis (tabes dorsalis, general paresis)?
A) Tertiary syphilis
B) Primary syphilis
C) Early latent syphilis
D) Secondary syphilis
**Answer: A** — Tertiary syphilis (occurring years after initial infection if untreated) manifests as gummatous disease, cardiovascular syphilis (aortitis), and late neurosyphilis.

**Q126.** The Jarisch-Herxheimer reaction after treating syphilis with penicillin is due to:
A) Release of treponemal antigens/endotoxin-like material causing an acute febrile inflammatory response
B) True penicillin allergy
C) Bacterial resistance
D) Herxheimer's is unrelated to syphilis treatment
**Answer: A** — The Jarisch-Herxheimer reaction results from rapid treponemal killing releasing pro-inflammatory antigens/lipoproteins, causing transient fever, myalgia, and rash within hours of starting effective antibiotic therapy.

**Q127.** As per current NACO/national guidelines, the syndromic management approach to genital ulcer disease typically covers empirically for:
A) Both syphilis and chancroid (and herpes where indicated) pending lab confirmation
B) HIV alone
C) Gonorrhea only
D) No empirical treatment is given
**Answer: A** — Syndromic management protocols (as promoted by NACO/WHO in resource-limited settings) treat genital ulcer disease empirically for the most likely causes (syphilis, chancroid, and considering herpes) without waiting for definitive lab results, given diagnostic constraints.

**Q128.** HIV-associated dermatoses that may signal advancing immunosuppression include which combination?
A) Eosinophilic folliculitis, extensive/recalcitrant molluscum, oral hairy leukoplakia, disseminated Kaposi sarcoma
B) Simple acne vulgaris
C) Isolated tinea pedis
D) Common warts only
**Answer: A** — These conditions (eosinophilic folliculitis, giant/recalcitrant molluscum, oral hairy leukoplakia from EBV, and Kaposi sarcoma from HHV-8) are markers of significant HIV-related immunosuppression.

**Q129.** Kaposi sarcoma pathogenesis is linked to infection with which virus?
A) Human herpesvirus-8 (HHV-8)
B) HPV
C) EBV
D) CMV
**Answer: A** — HHV-8 (Kaposi sarcoma-associated herpesvirus) is the causal agent of all epidemiological forms of Kaposi sarcoma, including AIDS-associated KS.

**Q130.** Genital herpes recurrences are most commonly caused by which HSV type, and what characterizes the classic lesion?
A) HSV-2; grouped vesicles on an erythematous base, often preceded by prodromal tingling
B) HSV-1; solitary painless ulcer
C) HSV-2; painless verrucous plaque
D) HSV-1; papulosquamous plaque
**Answer: A** — HSV-2 is responsible for the majority of recurrent genital herpes episodes, with classic grouped vesicles/erosions on an erythematous base and a prodrome of tingling/burning.

**Q131.** Congenital syphilis "Hutchinson's triad" includes:
A) Hutchinson's teeth, interstitial keratitis, and eighth nerve deafness
B) Saddle nose, saber shin, and frontal bossing
C) Snuffles, rash, and hepatosplenomegaly
D) Mulberry molars, ground-glass tibia, and gummas
**Answer: A** — Hutchinson's triad (a feature of late congenital syphilis) consists of Hutchinson's incisors (notched, peg-shaped), interstitial keratitis, and eighth cranial nerve deafness.

**Q132.** Which of the following best differentiates chancroid from primary syphilis clinically?
A) Chancroid ulcers are painful with ragged undermined edges and often with painful suppurative inguinal buboes; syphilitic chancres are painless and indurated
B) Both are equally painful
C) Chancroid never causes lymphadenopathy
D) Syphilis chancres are always multiple
**Answer: A** — Pain, ragged/undermined ulcer borders, and painful suppurative buboes distinguish chancroid from the classically painless, clean, indurated solitary chancre of primary syphilis.

**Q133.** According to standard STI treatment guidelines, the drug of choice for early (primary/secondary/early latent) syphilis is:
A) Single dose intramuscular benzathine penicillin G
B) Oral azithromycin single dose
C) Oral doxycycline for 21 days
D) Ceftriaxone single dose IM
**Answer: A** — A single intramuscular dose of benzathine penicillin G (2.4 million units) remains the standard of care for early syphilis; doxycycline is reserved for penicillin-allergic patients.

---

## SECTION 9: LEPROSY (Q134–Q150)

**Q134.** The Ridley-Jopling classification of leprosy is based primarily on:
A) Immunological spectrum from tuberculoid (TT) to lepromatous (LL), with borderline groups in between
B) Duration of disease only
C) Bacillary index alone
D) Age of the patient
**Answer: A** — Ridley-Jopling classifies leprosy along an immunological spectrum (TT, BT, BB, BL, LL) reflecting host cell-mediated immunity against *M. leprae*, from strong (TT) to weak/absent (LL).

**Q135.** WHO's operational classification for MDT purposes divides leprosy into paucibacillary (PB) and multibacillary (MB) primarily based on:
A) Number of skin lesions and nerves involved (and slit-skin smear positivity)
B) Age of onset
C) Presence of ENL reaction
D) HLA typing
**Answer: A** — WHO classifies PB (≤5 lesions, ≤1 nerve involved, smear-negative) vs MB (>5 lesions, >1 nerve, or smear-positive) leprosy to determine standardized MDT regimen and duration.

**Q136.** The standard WHO-MDT regimen for multibacillary leprosy in adults includes:
A) Rifampicin monthly supervised + Clofazimine (monthly supervised + daily) + Dapsone daily, for 12 months
B) Rifampicin + Dapsone only for 6 months
C) Dapsone monotherapy for 2 years
D) Rifampicin + Ofloxacin + Minocycline (ROM) single dose
**Answer: A** — MB leprosy standard WHO-MDT: monthly supervised rifampicin 600mg + clofazimine 300mg, plus daily clofazimine 50mg and dapsone 100mg, for 12 months.

**Q137.** The standard WHO-MDT regimen for paucibacillary leprosy in adults includes:
A) Rifampicin monthly supervised + Dapsone daily, for 6 months
B) Rifampicin + Clofazimine + Dapsone for 12 months
C) Dapsone alone for 6 months
D) Rifampicin single dose only
**Answer: A** — PB leprosy standard WHO-MDT: monthly supervised rifampicin 600mg plus daily dapsone 100mg for 6 months.

**Q138.** Type 1 lepra reaction (reversal reaction) is due to:
A) A sudden increase in cell-mediated immunity against *M. leprae* antigens, occurring especially in borderline leprosy
B) Immune complex deposition (Type III hypersensitivity)
C) IgE-mediated hypersensitivity
D) Direct bacillary invasion of new tissue
**Answer: A** — Type 1 reactions represent a delayed-type hypersensitivity (Type IV) upgrading (or occasionally downgrading) shift in cell-mediated immunity, most common in borderline (BT, BB, BL) leprosy.

**Q139.** Erythema nodosum leprosum (Type 2 reaction) is immunologically classified as which hypersensitivity type, and occurs predominantly in which leprosy type?
A) Type III (immune complex-mediated) hypersensitivity; occurs in LL and BL (multibacillary) leprosy
B) Type IV hypersensitivity; occurs in tuberculoid leprosy
C) Type I hypersensitivity; occurs in indeterminate leprosy
D) Type II hypersensitivity; occurs in all types equally
**Answer: A** — ENL is a Type III (immune complex) hypersensitivity reaction with systemic features (fever, arthralgia, tender nodules), occurring almost exclusively in the high-bacillary-load LL/BL end of the spectrum.

**Q140.** First-line management of a severe ENL reaction includes:
A) Systemic corticosteroids, with thalidomide as an alternative/steroid-sparing option where available
B) Increasing dapsone dose only
C) Stopping MDT permanently
D) Topical steroids alone
**Answer: A** — Systemic corticosteroids are first-line for moderate-severe ENL; thalidomide is highly effective (especially for recurrent ENL) where accessible, given teratogenicity precautions.

**Q141.** On slit-skin smear, the bacillary index (BI) measures:
A) Logarithmic density of bacilli per high-power field (Ridley's logarithmic scale, 0 to 6+)
B) Percentage of solid-staining (viable) bacilli
C) Number of granulomas
D) Nerve involvement severity
**Answer: A** — Bacillary Index uses Ridley's logarithmic scale (0 to 6+) to semi-quantitatively grade the density of acid-fast bacilli seen per field on slit-skin smear.

**Q142.** The Morphological Index (MI) in leprosy bacteriology refers to:
A) Percentage of solid (uniformly, intact) staining bacilli, indicating viable/live organisms
B) Total bacillary count regardless of viability
C) Number of skin sites sampled
D) Degree of nerve thickening
**Answer: A** — MI estimates the percentage of solid-staining (presumed viable) bacilli among the total counted, used to monitor treatment response as it should decline with effective therapy.

**Q143.** Histopathology of tuberculoid leprosy typically shows:
A) Well-formed epithelioid granulomas with dense lymphocytic cuffing, extending to the epidermis, with few or no demonstrable bacilli
B) Diffuse macrophage infiltrate with numerous bacilli and a Grenz zone
C) Foamy (Virchow) cells packed with bacilli
D) Caseation necrosis with Langhans giant cells and AFB-negative results
**Answer: A** — TT leprosy shows well-organized granulomas with heavy lymphocytic cuffing often abutting/eroding the epidermis and adjacent nerves, and paucibacillary (often negative) smears due to strong CMI clearing organisms.

**Q144.** Histopathology of lepromatous leprosy typically shows:
A) Diffuse sheets of foamy macrophages (Virchow cells) packed with numerous bacilli, minimal lymphocytes, and a Grenz zone
B) Well-formed granulomas with dense lymphocytic infiltration
C) Absence of any inflammatory infiltrate
D) Eosinophil-rich infiltrate
**Answer: A** — LL leprosy shows a subepidermal Grenz zone of uninvolved dermis, with diffuse macrophage/Virchow cell infiltration heavily laden with acid-fast bacilli, reflecting failed cell-mediated immunity.

**Q145.** Lucio phenomenon is a severe reactional state most associated with which form of leprosy?
A) Diffuse (Lucio) lepromatous leprosy, presenting with necrotizing vasculitis and hemorrhagic infarct-like lesions
B) Tuberculoid leprosy
C) Borderline tuberculoid leprosy
D) Indeterminate leprosy
**Answer: A** — Lucio phenomenon occurs in diffuse non-nodular lepromatous leprosy (Lucio leprosy), presenting with necrotizing vasculitis causing angular, bizarre-shaped ulcerations, historically associated with Mexican/Central American diffuse lepromatosis.

**Q146.** WHO's leprosy disability grading system grades deformity as:
A) Grade 0 (no disability), Grade 1 (loss of sensation, no visible deformity), Grade 2 (visible deformity/damage)
B) Grade I-IV based on nerve conduction studies only
C) Simple present/absent classification
D) Based purely on bacillary index
**Answer: A** — WHO disability grading uses a 3-tier system (0, 1, 2) for eyes, hands, and feet, based on sensory loss and visible deformity/damage, used for monitoring and rehabilitation planning.

**Q147.** Which nerve is most commonly and earliest affected in leprosy, producing claw hand deformity?
A) Ulnar nerve
B) Median nerve
C) Radial nerve
D) Common peroneal nerve
**Answer: A** — The ulnar nerve is frequently and early affected in leprosy (palpable thickening at the elbow), producing intrinsic hand muscle weakness/wasting and claw hand deformity (ulnar claw).

**Q148.** Drug resistance in leprosy is now monitored primarily through molecular detection of mutations in which gene(s) for rifampicin resistance?
A) *rpoB* gene
B) *folP1* gene
C) *gyrA* gene
D) *katG* gene
**Answer: A** — Rifampicin resistance in *M. leprae* is associated with mutations in the *rpoB* gene (RNA polymerase beta subunit), analogous to rifampicin resistance mechanisms in *M. tuberculosis*.

**Q149.** Histoid leprosy is a distinct clinical-histological variant characterized by:
A) Discrete, shiny, dome-shaped nodules with histology showing spindle-shaped histiocytes packed with bacilli, often seen with irregular treatment/dapsone resistance
B) Absence of bacilli on smear
C) Predominance of lymphocytes over histiocytes
D) Occurs exclusively in tuberculoid leprosy
**Answer: A** — Histoid leprosy shows characteristic shiny cutaneous/subcutaneous nodules with fusiform histiocytes densely packed with bacilli, often arising in the context of inadequate/irregular treatment or drug resistance.

**Q150.** In a patient developing acute neuritis with a "silent" (painless) rapidly progressive nerve function loss during leprosy treatment, urgent management includes:
A) Prompt systemic corticosteroids to prevent permanent nerve damage
B) Watchful waiting without treatment
C) Immediate surgical nerve decompression as first-line always
D) Stopping MDT permanently
**Answer: A** — Silent neuropathy (painless but progressive nerve function impairment) is a leprosy emergency requiring prompt corticosteroid therapy to prevent irreversible nerve damage; MDT is continued.

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## SECTION 10: DERMATOSURGERY & COSMETOLOGY (Q151–Q166)

**Q151.** Jessner's solution and glycolic acid are examples of which depth category of chemical peel?
A) Superficial peels
B) Medium-depth peels
C) Deep peels
D) None are peeling agents
**Answer: A** — Glycolic acid (alpha-hydroxy acid) and Jessner's solution are classic superficial peeling agents, acting on the epidermis with minimal downtime.

**Q152.** Trichloroacetic acid (TCA) at 35-50% concentration is generally classified as which depth peel, and produces what clinical endpoint (frosting)?
A) Medium-depth peel; level II-III frosting (white with erythema showing through)
B) Superficial peel; no frosting
C) Deep peel; solid white frosting only
D) It is not used as a peeling agent
**Answer: A** — Medium-depth TCA peels (typically 35-50%) target the papillary to upper reticular dermis, producing level II frosting (white frosting with erythema showing through) as the clinical endpoint.

**Q153.** Phenol-croton oil peels are classified as:
A) Deep peels, reaching the mid-reticular dermis, requiring cardiac monitoring due to phenol's cardiotoxicity risk
B) Superficial peels only
C) Peels with no systemic risk
D) Only used for acne scarring, never for rhytides
**Answer: A** — Phenol-based deep peels penetrate to the mid-reticular dermis and carry risk of cardiac arrhythmia from phenol absorption, necessitating cardiac monitoring and slow application in segments.

**Q154.** Q-switched Nd:YAG laser (1064 nm) is preferentially used for which indication due to deeper penetration and lower melanin absorption risk in darker skin?
A) Tattoo removal (black ink) and dermal pigmented lesions (e.g., nevus of Ota) in darker Fitzpatrick skin types
B) Vascular lesions exclusively
C) Hair removal in all skin types with equal safety
D) Only for ablative resurfacing
**Answer: A** — The 1064nm Nd:YAG wavelength penetrates deeper with relatively lower melanin absorption, making it safer for treating dermal pigmentation and tattoos in darker skin types (reduced risk of PIH compared to shorter wavelengths).

**Q155.** For hair removal lasers, longer wavelengths (e.g., long-pulsed Nd:YAG 1064nm) are preferred in which Fitzpatrick skin types to minimize epidermal injury?
A) Fitzpatrick IV-VI (darker skin types)
B) Fitzpatrick I-II only
C) All skin types equally suited to shorter wavelengths
D) Only in blonde/white hair
**Answer: A** — Longer wavelength lasers (Nd:YAG) reduce competing epidermal melanin absorption, making them safer for hair removal in darker skin types (IV-VI), versus shorter-wavelength diode/alexandrite lasers more suited to lighter skin.

**Q156.** In hair transplantation, Follicular Unit Extraction (FUE) differs from Follicular Unit Transplantation (FUT/strip method) primarily by:
A) FUE harvests individual follicular units directly from the scalp without a linear strip excision, avoiding a linear donor scar
B) FUT uses individual punches while FUE uses a strip
C) FUE always yields fewer grafts than FUT
D) There is no difference in technique
**Answer: A** — FUE extracts individual follicular units using small punches directly, avoiding the linear scar associated with strip harvesting (FUT), though it may be more time-intensive per graft.

**Q157.** Which complication is most specifically associated with dermal filler injection due to vascular compromise?
A) Vascular occlusion leading to skin necrosis or, rarely, blindness (via retrograde embolization into ophthalmic artery branches)
B) Simple bruising only
C) Allergic contact dermatitis
D) Post-inflammatory hyperpigmentation only
**Answer: A** — Inadvertent intravascular filler injection (especially in glabella, nasal, and periorbital areas) can cause tissue necrosis or catastrophic vision loss via retrograde flow into the ophthalmic artery/central retinal artery.

**Q158.** Botulinum toxin exerts its therapeutic effect by:
A) Cleaving SNARE proteins (e.g., SNAP-25) to block acetylcholine release at the neuromuscular junction
B) Blocking postsynaptic acetylcholine receptors
C) Enhancing acetylcholinesterase activity
D) Directly paralyzing muscle fibers via calcium channel blockade
**Answer: A** — Botulinum toxin type A cleaves SNAP-25, a SNARE protein required for vesicle fusion, thereby preventing acetylcholine release and causing temporary chemodenervation.

**Q159.** A recognized complication of botulinum toxin injection for glabellar lines, if the toxin diffuses beyond the intended muscle, is:
A) Ptosis (from diffusion to levator palpebrae superioris)
B) Permanent nerve damage
C) Systemic paralysis at cosmetic doses
D) Hyperhidrosis
**Answer: A** — Eyelid ptosis is a recognized, generally transient complication when botulinum toxin diffuses to affect the levator palpebrae superioris, especially with improper injection technique/placement.

**Q160.** Cryotherapy with liquid nitrogen achieves tissue destruction primarily through:
A) Formation of intracellular ice crystals causing cellular disruption, plus vascular stasis on thawing
B) Direct chemical caustic burn
C) Thermal coagulation (heat-based)
D) Enzymatic digestion
**Answer: A** — Liquid nitrogen cryotherapy destroys tissue via intracellular ice crystal formation, osmotic shifts, and secondary vascular stasis/thrombosis during the thaw phase.

**Q161.** Platelet-rich plasma (PRP) therapy in androgenetic alopecia is believed to work primarily via:
A) Release of growth factors (PDGF, VEGF, EGF) from activated platelets promoting follicular stem cell activity and neovascularization
B) Direct DHT blockade
C) Mechanical stretching of follicles
D) Antifungal action
**Answer: A** — PRP's proposed mechanism involves growth factor release from platelet alpha granules stimulating dermal papilla cells, angiogenesis, and prolonging the anagen phase.

**Q162.** Vitiligo surgery (e.g., melanocyte-keratinocyte transplantation, punch grafting) is generally most successful in:
A) Stable, segmental, or localized vitiligo unresponsive to medical therapy
B) Rapidly progressing generalized vitiligo
C) Active vitiligo with new lesions appearing weekly
D) Vitiligo universalis
**Answer: A** — Surgical repigmentation techniques require disease stability (no new lesions/progression for typically 6-12 months) and work best in localized/segmental, treatment-resistant vitiligo.

**Q163.** Suction blister epidermal grafting for vitiligo relies on separation occurring at which histological level?
A) The lamina lucida (dermo-epidermal junction), analogous to a level of blister formation similar to some immunobullous diseases
B) Within the stratum corneum only
C) Deep dermis
D) Subcutaneous fat plane
**Answer: A** — Suction creates a split at the dermo-epidermal junction (lamina lucida), yielding a thin epidermal graft containing melanocytes for transplantation onto vitiligo/leukodermic recipient sites.

**Q164.** Which laser is considered gold standard for treating vascular lesions like port-wine stains, based on selective photothermolysis targeting oxyhemoglobin?
A) Pulsed dye laser (585-595 nm)
B) CO2 laser
C) Er:YAG laser
D) Alexandrite laser (755nm) exclusively
**Answer: A** — Pulsed dye laser wavelengths (585-595nm) closely match oxyhemoglobin absorption peaks, providing the gold standard, selective treatment for vascular lesions like port-wine stains while minimizing epidermal damage.

**Q165.** Fractional laser resurfacing differs from traditional ablative laser resurfacing by:
A) Treating only a fraction of the skin surface in microthermal zones, sparing surrounding tissue for faster healing
B) Treating the entire skin surface uniformly with equal downtime
C) Using no thermal energy at all
D) Being suitable only for tattoo removal
**Answer: A** — Fractional lasers create microscopic treatment zones (columns of thermal injury) surrounded by untreated tissue, allowing faster re-epithelialization and reduced downtime/complications versus fully ablative resurfacing.

**Q166.** Which peel/procedure carries the highest risk of post-inflammatory hyperpigmentation in darker Fitzpatrick skin types, requiring careful patient selection and pre-treatment?
A) Deep/medium-depth peels and aggressive ablative resurfacing
B) Superficial glycolic acid peels only
C) Botulinum toxin injections
D) PRP therapy
**Answer: A** — Deeper peeling/resurfacing procedures carry substantially higher PIH risk in Fitzpatrick IV-VI skin due to greater inflammatory melanocyte stimulation, necessitating priming regimens and cautious depth selection.

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## SECTION 11: DRUG REACTIONS & THERAPEUTICS (Q167–Q183)

**Q167.** SCORTEN, used to predict mortality in SJS/TEN, includes which of the following parameters?
A) Age >40, heart rate >120, malignancy, BSA detached >10%, serum urea/glucose/bicarbonate abnormalities
B) Only the extent of skin detachment
C) Duration of drug exposure
D) Presence of eosinophilia
**Answer: A** — SCORTEN incorporates seven independent prognostic factors (age, heart rate, cancer, % BSA detachment, serum urea, glucose, and bicarbonate) to estimate mortality risk in SJS/TEN.

**Q168.** DRESS syndrome (Drug Reaction with Eosinophilia and Systemic Symptoms) typically has an onset of how long after starting the culprit drug?
A) 2-8 weeks (delayed onset)
B) Within 24 hours
C) Immediately on first dose
D) Only after 6 months of therapy
**Answer: A** — DRESS characteristically has a delayed onset of 2-8 weeks after drug initiation, distinguishing it from immediate hypersensitivity reactions.

**Q169.** Fixed drug eruption classically presents as:
A) Solitary or few well-demarcated, round/oval, dusky violaceous plaques that recur at the same site with re-exposure to the culprit drug
B) Widespread symmetric maculopapular rash
C) Diffuse urticaria
D) Target lesions only
**Answer: A** — FDE's hallmark is recurrence at the identical anatomical site with repeat drug exposure, presenting as sharply demarcated dusky/violaceous patches, sometimes bullous.

**Q170.** The key clinical/histological distinction between erythema multiforme and Stevens-Johnson syndrome is:
A) EM is typically trigg

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