An acute photosensitivity reaction in EPP (Erythropoietic protoporphyria); Sun-induced dermatitis usually occurs on the dorsal side of the hands and the exposed areas of the arms. Unlike contact dermatitis, a symmetrical location and tiny palpable lesions are characteristic.
Photosensitive dermatitis may cause swelling, difficulty breathing, a burning sensation, a red itchy rash that sometimes resembles small blisters, and skin peeling. Blotches may also appear, and the itching can persist for long periods of time.