<unk>  <unk> , or polymorphic<unk>  eruption, is a skin complaint caused by sunlight.  Symptoms include skin irritations, which may be itchy or painful, and are sometimes confused with hives.  These irritations appear upon exposure to sunlight—sometimes as little as 15 minutes of exposure to the sun can bring onset of the condition—and may last from 1 to 7 days.  Generally,<unk>  resolves without treatment; also,<unk>  irritations generally leave no scar.  The cases of this condition are most common between the spring and autumn months in the northern hemisphere.
Typically, 10-20% of the population are affected.  It is more common in females than in males. The condition can affect all ethnic groups and research suggests that 20% of patients have a family history of the complaint.  Those suffering from<unk>  usually do so by age 30.
The cause of<unk>  is not yet understood. It is thought to be due to a type IV delayed-type hypersensitivity reaction.
Polymorphous light eruption
Acneiform eruption
Papuloerythroderma of Ofuji
Drug eruption
Poikiloderma of civatte
Phytophotodermatitis
Alopecia mucinosa
Pityriasis rubra pilaris