The most common form of this condition, polymorphous light dermatosis, generally affects areas of skin that have not got accustomed to the sun. Its cause is high UVA radiation.

• 这种情况下最常见的发病症状就是多形性光皮肤病，主要是病变区皮肤不适应太阳光，这是由强烈的紫外线照射引起的。