Polymorphous light eruption is a chronic skin inflammation cause by sunlight. Its incidence has a seasonal pattern: aggravating in spring and summer, alleviating in fall and winter, and coming back in the next year. For some patients it continues for years without alleviation. Young women are at increased risk. It is often seen on areas exposure to sun. It starts with local burning or itching sensation after sun exposure. Polymorphous rash occurs hours or days later. Although it is usually self-healing, those with broad skin lesions and severe symptoms require medication such as corticosteroids, azathioprine, cyclosporine, thalidomide, mycophenolate and mofetil.
How is Polymorphous light eruption treated in practice?