PUVA keratosis
Encyclopedia
A PUVA keratosis is a precancerous keratotic skin lesion that arises from exposure to psoralen
Psoralen
Psoralen is the parent compound in a family of natural products known as furocoumarins. It is structurally related to coumarin by the addition of a fused furan ring, and may be considered as a derivative of umbelliferone...

 plus ultraviolet A light therapy.
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