Clinical Analysis: Palmar Skin Lesions

Image Findings Summary

• Well-demarcated, thickened hyperpigmented plaque on the thenar eminence/proximal-mid palm
• Prominent lichenification (exaggerated skin markings, "leathery" texture)
• Deep linear fissures, the deepest exposing the pink/red dermis with a small bleeding point
• Fine-to-moderate desquamation (scaling/flaking) at plaque edges
• A gold bangle worn tightly at the wrist just proximal to the lesion

• Generalized dry, xerotic skin with prominent skin creases across the dorsum
• A deep transverse fissure over the DIP joint of the index finger
• Localised hyperkeratosis with grayish-ashy discoloration and scaling at that joint
• The overall hand shows darkly pigmented, aged/weather-worn skin consistent with chronic sun and mechanical exposure

Most Likely Diagnosis

Differential Diagnoses

Key Observations Supporting Chronic Eczema + LSC

1. Thenar localization - hyperkeratotic hand dermatitis classically involves the middle or proximal palm, precisely the location seen here
2. Lichenification with hyperpigmentation - the "itch-scratch-itch" cycle of LSC produces this exact morphology; chronic rubbing causes both epidermal thickening and melanin incontinence
3. Fissuring - expected in chronic hyperkeratotic dermatitis; painful fissures are the main morbidity
4. Dorsal xerosis + DIP fissuring - consistent with chronic hand eczema extending to the dorsum, aggravated by occupational wet/dry work or detergent exposure
5. Tight bangle at wrist - may act as a local irritant/allergen (nickel/metal contact) and occlusive pressure factor contributing to the proximal palmar lesion

Suggested Work-Up

• KOH scraping - rule out tinea manuum (fungal infection)
• Patch testing - rule out allergic contact dermatitis (metal from bangle, detergents, rubber)
• Skin biopsy - if psoriasis cannot be clinically excluded (histopathology shows chronic spongiotic dermatitis in eczema vs. psoriasiform pattern in psoriasis, though overlap exists)
• Assess occupation, wet work exposure, and irritant/allergen history

Management Principles

1. Protection - vinyl/cotton gloves during wet work; protective gloves for manual work
2. Barrier repair - heavy emollient (white petrolatum) applied after every water exposure; overnight occlusion with plastic wrap
3. Topical corticosteroids - potent to ultrapotent (e.g., clobetasol propionate) as first-line; "soak and smear" technique enhances efficacy
4. Fissure care - cyanoacrylate glue (tissue adhesive) or hydrocolloid dressings for painful fissures
5. Address the bangle - consider removing or switching to a non-metallic bangle to eliminate local irritant/contact allergen
6. Treat LSC component - intralesional triamcinolone for recalcitrant lichenified plaque; occlusive hydrocolloid dressings break the itch-scratch cycle
7. If psoriasis confirmed: coal tar preparations, topical vitamin D analogues, or phototherapy

Note: The tight gold bangle directly over the lesion border is clinically significant and should be evaluated for contact sensitization (nickel or other metal allergy is a known trigger for palmar eczema in jewelry wearers).

Diagnosis

Primary: Hyperkeratotic Hand Dermatitis (Chronic Eczema of the Palm)

• Hyperkeratotic, fissure-prone plaque on the proximal/mid palm - the hallmark location for this condition
• No vesicles (distinguishes it from pompholyx/dyshidrosis)
• Lichenification with hyperpigmentation - the "leathery" exaggerated skin markings indicate chronic repetitive rubbing/scratching, driving an itch-scratch-itch cycle
• Dorsal hand xerosis with DIP fissure - extension of chronic hand dermatitis
• Older adult; likely history of manual/wet work or occupational exposure
• Tight gold bangle at the wrist - a potential contact irritant or allergen (nickel/metal) contributing to the proximal lesion

• Palmar psoriasis - must be ruled out; look for nail pitting, pustules, silvery scale
• Tinea manuum - always send KOH scraping (especially in unilateral or asymmetric disease)
• Allergic contact dermatitis - patch testing if occupation involves chemicals

Treatment

Step 1: Investigations First

Step 2: Protection and Barrier Repair (Non-negotiable)

• Wear vinyl gloves (with cotton glove liner) for all wet work, cleaning, and chemical exposure
• Apply heavy emollient (white petrolatum is first choice - cheap, non-sensitizing) after every hand wash and water exposure
• At night: apply emollient and occlude with a plastic bag or vinyl glove - significantly improves palmar dryness and fissuring
• Avoid harsh soaps; use mild/fragrance-free cleansers

Step 3: Topical Pharmacotherapy

Step 4: Refractory/Severe Disease

Step 5: Treat the LSC Component

• Occlusive hydrocolloid dressings over the lichenified palmar plaque - physically breaks the itch-scratch cycle
• Intralesional triamcinolone acetonide 10 mg/mL - most effective for a discrete lichenified plaque
• Antipruritic agents (topical menthol, pramoxine) at night to reduce nocturnal scratching

Summary at a Glance

DIAGNOSE: Hyperkeratotic Hand Dermatitis + LSC
EXCLUDE:  Tinea (KOH) → Psoriasis (biopsy) → Contact allergy (patch test)
TREAT:    1. Emollient + protection
          2. Potent topical steroid (soak & smear, occlusion at night)
          3. Coal tar ointment + keratolytic for thick plaques
          4. Intralesional steroid for lichenified plaque
          5. Fissure glue for painful cracks
          6. Refractory → alitretinoin / dupilumab / PUVA

• Andrews' Diseases of the Skin, p. 95 (hyperkeratotic hand dermatitis)
• Dermatology 2-Volume Set 5e, p. 129 (lichen simplex chronicus)
• Dupilumab for CHE systematic review, Dermatitis 2026 (PMID 39501849)

Betamethasone Ointment

• Ointment base is occlusive — enhances penetration through the thick hyperkeratotic palmar skin
• No preservatives — lower risk of contact sensitization (important since allergic contact dermatitis is a differential)
• Better moisturizing effect on the fissured, xerotic skin

• Apply once nightly under occlusion (plastic bag or vinyl glove over the hand)
• "Soak and smear" — soak hands in plain water 10-20 minutes, pat dry, immediately apply betamethasone ointment, then occlude
• Continue until plaques clear, then taper to 2-3×/week maintenance
• Avoid prolonged uninterrupted use on palms beyond 4 weeks without review (atrophy risk is lower on palms due to thick skin, but still monitor)

Clotrimazole Ointment

Reason 1: Empirical antifungal cover

Reason 2: The combination product

⚠️ Important caveat: The combination product also contains neomycin in many formulations (triple combination: betamethasone + clotrimazole + neomycin / gentamicin). These triple-combination products (Panderm, Quadriderm, etc.) should be avoided for chronic use on the hands — neomycin is a well-known contact allergen and can worsen or perpetuate dermatitis.

Recommended Regimen

What to Add

• Salicylic acid 6% ointment applied in the morning (keratolytic) helps soften the hyperkeratotic plaque so the betamethasone penetrates better in the evening
• Oral antihistamine (cetirizine 10 mg at night) — reduces nocturnal itching and breaks the itch-scratch-lichenification cycle

When to Reassess (2-4 weeks)

• If KOH positive → continue clotrimazole, add oral terbinafine 250 mg/day × 2-4 weeks
• If no improvement with betamethasone → consider intralesional triamcinolone to the lichenified plaque, or step up to clobetasol propionate 0.05%
• If worsening on betamethasone+clotrimazole → suspect allergic contact dermatitis; refer for patch testing and switch to a plain emollient base