People with psoriasis treated with a combination of the drug psoralen and ultraviolet A light therapy (PUVA) have increased levels of human papillomavirus (HPV) in their skin, says an Austrian study in the March issue of the Archives of Dermatology.Previous research identified a link between PUVA therapy and increased risk of skin cancer, but the causes of that increased risk were not pinpointed. HPV has been closely linked to skin cancer.
