Disseminated superficial actinic porokeratosis

Disseminated superficial actinic porokeratosis (DSAP) is an acquired condition occurring in sun exposed skin.

Lesions are similar to those seen in porokeratosis of Mibelli, with a flat, central cleared area, surrounded by a raised edge, surmounted by a furrow. The raised active edge spreads peripherally. DSAP lesions are usually multiple, and evidence of significant actinic damage to the surrounding skin is usually present.

Treatment:

• These lesions are difficult to treat and respond variable to treatment.
• Reports of success with 5% 5-fluorouracil cream, liquid nitrogen cryotherapy and topical retinoids exist, but results are often suboptimal.
• Sun blocks should be used to prevent further damage.

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