Granulomatous Reaction Pattern of the Skin Granuloma Annulare Necrobiosis Lipoidica Necrobiotic Xanthogranuloma    Rheumatoid Nodule Lupus Vulgaris Cutaneous Sarcoidosis Melkersson Rosenthal Syndrome Annular Elastolytic Giant Cell Granuloma Skin lesion in Crohn's Disease Blastomycosis-like pyoderma Foreign body granuloma Rosacea Interstitial Granulomatous Dermatitis Interstitial Granulomatous Drug Reaction Granulomatous T-cell lymphoma

Epidermal naevus is a developmental malformation of the epidermis. 

These  lesions  are  commonly located on the  neck, trunk or extremeties.

Macroscopically epidermal naevi  present as warty brown plaque, scaly  discolouration or linear lesions.

Microscopically different patterns are noted. The common variant displays laminated  hyperkeratosis, papillomatosis and acanthosis. There is thickening of the granular layer and mild increase in basal melanin pigment. Some of the rare histologic patterns resemble  seborrheic keratosis , acrokeratosis verruciformis or epidemolytic hyperkeratosis.   Image Link

INFLAMMATORY LINEAR VERRUCOUS  EPIDERMAL NAEVUS

This lesion ,also known as ILVEN, is clinicopathological subgroup of epidermal naevus. It resembles psoriasis both clinically and histologically.

The lesion presents as pruritic linear eruptions on the lower extremities.

Histopathology reveals psoriasiform epidermal hyperplasia and overlying alternate  parakeratosis and orthokeratosis   Image Link