[Actinic keratoses--sequelae of long-term PUVA therapy].

Multiple actinic keratoses occurred on skin regions that were not exposed to the sun in one (0.15%) of 672 psoriasis patients receiving long term PUVA treatment after receiving a cumulative UVA dose of 883 J/cm2. Apart from skin type II, no risk factors were found. Besides clinical signs of chronic, light-induced skin damage, there were minor indications of epidermal dystrophy. Acantholysis was abnormally common in the regions affected by actinic keratosis.