Lesions in an 55 year old female present with itching and mild burning sensation on bilateral limbs what could it be
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lichen planus pigmentosus diagnosis treatment
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Most Likely Diagnosis: Lichen Planus (LP) with Lichen Planus Pigmentosus (LPP) features
What the images show
Analyzing all four photos together:
| Image | Findings | Significance |
|---|---|---|
| Shoulder/upper arm | Single smooth, shiny, pearlescent oval raised plaque | Classic LP plaque or morphea-like LP |
| Dorsal hand #1 | Multiple small skin-colored to pink papules + hypopigmented patch | Classic LP papules on dorsal hand (a hallmark site) |
| Forearm (blurry) | Multiple oval, dark violaceous-brown macules arranged in a linear/grouped pattern | Lichen planus pigmentosus or resolving LP with post-inflammatory hyperpigmentation |
| Wrist/dorsal hand #2 | Small discrete papules on xerotic skin background | Active LP papules |
The bilateral, symmetric distribution on the limbs, the violaceous papules on dorsal hands, and the dark hyperpigmented oval macules on the forearms in a middle-aged woman fit LP and LPP very well.
Lichen Planus - Core Features
LP is a T-cell mediated inflammatory dermatosis with increased Th1 cytokine expression at the basement membrane zone.
Classic lesion: Small, flat-topped, polygonal, violaceous papules with a glistening surface. Wickham striae (white/gray streaks on surface) are pathognomonic. Lesions start pinpoint and expand to 0.5-1.5 cm plaques.
Predilection sites: Flexor wrists, dorsal hands, medial thighs, shins, trunk - exactly matching this patient's distribution.
Symptoms: Pruritus is prominent and often disproportionate to the visible lesion load. Patients typically rub rather than scratch. Mild burning sensation is also reported.
Symmetry: Bilateral and relatively symmetric distribution is characteristic.
- Andrews' Diseases of the Skin, p. 259
Here is what koebnerized LP looks like on a limb (note the linear shiny plaque - very similar to image 1):
Lichen Planus Pigmentosus (LPP) - Explaining the Dark Macules
LPP is a recognized variant of LP, particularly common in darker-skinned, South/Southeast Asian and Middle Eastern individuals.
Features:
- Symmetrical brown to gray-brown poorly demarcated macules and patches
- Mainly photoexposed sites (face, neck, dorsal hands/arms) but also flexural folds
- The dark oval macules seen on the forearm in image 3 match this perfectly
- Associated with mustard oil and amla oil use (worth asking about)
- Histology: epidermal atrophy, basal vacuolation, perivascular lymphocytic infiltrate, melanophages in superficial dermis
Here is a textbook example of LPP on the neck (note the coalescing hyperpigmented macules):
- Fitzpatrick's Dermatology, p. 1415
Differential Diagnoses to Consider
| Condition | Points for | Points against |
|---|---|---|
| Lichen Planus | Bilateral limbs, papules on dorsal hands/wrists, pruritus, burning, age group | Need Wickham striae confirmation |
| Lichen Planus Pigmentosus | Dark oval macules, darker skin, bilateral arms | Typically less pruritic |
| Prurigo Nodularis | Papules, pruritus | Usually more excoriated, dome-shaped nodules |
| Fixed Drug Eruption | Oval hyperpigmented macules | Usually fewer, recur at same site with drug exposure |
| Erythema Dyschromicum Perstans (Ashy Dermatosis) | Gray-brown macules, similar histology | Tends to involve trunk more |
| Morphea | The shiny shoulder plaque (image 1) | Morphea typically ivory/white, non-pruritic |
What to do next
- Dermoscopy - look for Wickham striae (white lines/dots) on the papules, confirms LP in most cases
- Skin biopsy - especially of a papule and a hyperpigmented macule separately - shows lichenoid tissue reaction (band-like lymphocytic infiltrate at DEJ, basal vacuolation, colloid bodies)
- Drug history - many drugs cause lichenoid reactions (ACE inhibitors, thiazides, NSAIDs, antimalarials, beta-blockers)
- Ask about mustard oil/amla oil use (LPP association)
- Check oral mucosa - up to 70% of LP patients have oral involvement (reticulate white patches on buccal mucosa)
- Hepatitis C serology - LP has a well-established association with HCV
Management (once confirmed)
- First-line: Topical corticosteroids (mid-to-high potency, e.g., betamethasone valerate, clobetasol) for active papules
- Pruritus: Oral antihistamines, topical tacrolimus or pimecrolimus for sensitive areas
- Widespread disease: Systemic steroids (short course), acitretin, hydroxychloroquine, cyclosporine, or methotrexate
- LPP pigmentation: Sunscreen, topical retinoids, azelaic acid - note that treatments give only minimal improvement in established pigmentation per Fitzpatrick's
- A 2026 systematic review in Dermatol Surg found laser therapy (Q-switched Nd:YAG, fractional) may offer benefit for LPP pigmentation (PMID: 40965050)
Bottom line: This 55-year-old woman most likely has Lichen Planus with Lichen Planus Pigmentosus features - a T-cell mediated inflammatory condition. The bilateral symmetric distribution, violaceous papules on dorsal hands/wrists, dark hyperpigmented oval macules on the forearms, pruritus, and mild burning are all characteristic. Biopsy and dermoscopy would confirm the diagnosis. A drug and oil exposure history plus hepatitis C serology should be obtained.
Disclaimer: This is educational clinical analysis, not a substitute for in-person examination and diagnosis by a licensed dermatologist. Please refer the patient for formal evaluation and biopsy.
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