[Actinic keratosis].

Actinic keratosis is a precancerous lesion that is commonly seen in the elderly patient and requires treatment. It shows a predilection for areas of the skin that are exposed to the sun, and usually manifests as multiple skin-colored or discrete reddish scaly verrucous plaques. The diagnosis is usually based on the clinical appearance of the lesion. Therapeutic options include physical, immunological and chemical measures. The choice of treatment is determined by numerous factors, and can be adapted to the individual situation presenting.