Seborrheic dermatitis is a skin condition that causes a rash with greasy, flaky skin patches. It often occurs on the scalp and face. The rash may also appear on other parts of the body, such as the ears and the genital area.

This condition can affect people of all ages. In babies, it's called cradle cap, and it usually goes away without treatment.

In teens and adults, seborrheic dermatitis is usually treated with antifungal shampoos and medicines that are put on the skin. Treatment doesn't cure this dermatitis, but it can help control the symptoms.

This is often a long-term (chronic) condition, with symptoms that come and go. Stress can make symptoms worse. So can weather that's cold and dry.