Lichen simplex

**Definition:** Circumscribed pruritic lichenification of the skin of any origin. If a circumscribed area of skin is subjected to repeated rubbing or scratching, localised epidermal thickening or lichenification will ensue. The nape of the neck, genitalia, perianal area and lateral calf are commonly affected sites.

**Exclusions:** - Atopic neurodermatitis - Diffuse neurodermatits