What is (are) Disseminated superficial actinic porokeratosis ?
Disseminated superficial actinic porokeratosis (DSAP) is a skin condition that causes dry patches. It is characterized by a large number of small, brownish patches with a distinctive border, found most commonly on sun-exposed areas of the skin (particularly the arms and legs). DSAP usually starts during the third or fourth decade of life and rarely affects children. Lesions usually appear in summer and improve or disappear during winter. While it is usually benign (not cancerous), squamous cell carcinoma or Bowens disease may occasionally develop within patches. DSAP may be inherited in an autosomal dominant matter or may occur sporadically (in people with no family history of DSAP). Some cases are caused by a change (mutation) in the MVK or SART3 genes. Treatment is generally not effective long-term but may include sun protection, topical medications, cryotherapy, and/or photodynamic therapy.