What causes disseminated superficial actinic porokeratosis (DSAP)?

Updated: Oct 09, 2020
  • Author: Amarateedha Prak LeCourt, MD; Chief Editor: William D James, MD  more...
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Sun exposure and/or artificial ultraviolet radiation exposure in a patient who is genetically predisposed causes disseminated superficial actinic porokeratosis (DSAP). Exacerbations have been reported following prolonged sun exposure, repeated tanning bed exposure, electron beam radiation therapy, and therapeutic phototherapy or photochemotherapy for psoriasis. Drug-induced photosensitivity may play a role. Protection from ultraviolet radiation may lead to spontaneous resolution. Additionally, immunosuppression predisposes patients to both DSAP and nonactinic disseminated superficial porokeratosis (DSP).

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