Lichen planus actinicus is a variant of lichen planus

Lichen planus

Lichen planus is a chronic mucocutaneous disease that affects the skin, tongue, and oral mucosa. The disease presents itself in the form of papules, lesions, or rashes. Lichen planus does not involve lichens, the fungus/algae symbionts that often grow on tree trunks; the name refers to the dry and...

 that is more common in Middle Eastern countries in spring and summer, where sunlight appears to have a precipitating effect, such that exposed areas of the face, dorsal hands and arms, and nape of the neck are usually affected by papule

Papule

A papule is a circumscribed, solid elevation of skin with no visible fluid, varying in size from a pinhead to 1 cm.With regard to the quote "...varying in size from a pinhead to 1cm," depending on which text is referenced, some authors state the cutoff between a papule and a plaque as 0.5cm,...

s that are hyperpigmented and violaceous-brown in color with a thready, rolled edge showing well-defined borders.