give me every possible ddx for final exam of deramtology topics hand e

give me every possible ddx for final exam of deramtology topics hand eczema, icd, acd, acne vulgaris, acne rosacea, perioral dermatitis, psoriasis, seborrheic dermatitis, pityriasis rosea, lichen planus, impetigo, folliculitis, carbuncle, furuncle, all tinea inf., candidiasis, syphilis, hsv, hzv, warts, molluscum contagiosum, scabies, pediculosis, , pemphigus vulgaris, bullous pemphigoid, alopecia areata, androgenic alopecia, vitiligo, melanoma, seborrheic keratosis, bcc, scc these all tell each of them

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All 32 conditions are covered. Here are a few high-yield exam tips to go with the guide above:

High-Yield Exam Tips

The "Always Rule Out" Principle:

Any papulosquamous eruption involving palms/soles = RPR for secondary syphilis
Any non-healing "eczema" plaque = biopsy for superficial BCC or CTCL
Any single dark lesion on a nail = biopsy for subungual melanoma

The Key Distinguishing Tests:

Condition	Confirmatory Test
Tinea	KOH preparation
Candidiasis	KOH (pseudohyphae + yeast)
Scabies	Skin scraping + microscopy
Syphilis	RPR/VDRL then FTA-ABS
HSV/HZV	Tzanck smear, PCR
Pemphigus vulgaris	DIF (IgG intercellular)
Bullous pemphigoid	DIF (IgG linear at BMZ)
Alopecia areata	Trichoscopy ± biopsy
Melanoma	Dermoscopy + excisional biopsy

The "No Comedones" Rule:

Rosacea, perioral dermatitis, folliculitis, eosinophilic folliculitis = no comedones (unlike acne vulgaris)

Nikolsky Sign:

Positive = pemphigus vulgaris (intraepidermal split, flaccid blisters)
Negative = bullous pemphigoid (subepidermal split, tense blisters)

also give ddx of atopic dermatitis

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