Keratosis actinica lichenoid type L57.00

Circumscribed, solar precancerous damage to the skin of fair-skinned, light-sensitive people caused by chronic cumulative exposure to light (> 10 to 60 years).

Actinic keratoses are so-called precanceroses, i.e. non-invasive, early (in situ) squamous cell carcinomas. This view is underlined by new names such as SCC of the actinic keratosis type (squamous cell carcinoma in situ) or KIN (keratinocytic intraepidermal neoplasia).

Clinically related to the erythematous type (see below Keratosis actinica (overview). Variably sized, sharply demarcated, red, shiny, surface-smooth patches, papules, or plaques (from a few mm to several cm in diameter) are found.

Histological features of lichen planus with acanthosis, hypergranulosis and orthohyperkeratosis as well as lichenoid round cell infiltrate in the upper corium.

S.u. Keratosis actinica (overview)