What is seborrheic dermatitis?

Seborrheic dermatitis (say "seh-buh-REE-ick der-muh-TY-tus") is a rash with greasy, flaky skin patches. The patches can look whitish. With lighter skin, the skin under the patches can look reddish. With darker skin, the skin can also look darker or lighter than the usual skin color.

The rash may appear on many parts of the body. It may be on the scalp, face (especially the eyebrow area and near the nose and mouth), ears, underarms, or genital area or under the breasts. The flaky skin on the scalp is called dandruff.

This rash is often a long-term (chronic) condition, with symptoms that come and go. It may get worse with cold, dry weather or stress. Treatments include antifungal shampoos and medicines that are put on the skin.

What causes this isn't fully understood. It may involve the oil glands in skin. A type of skin fungus, or yeast, may also be linked with this condition.

Symptoms include a rash with greasy, flaky skin patches. The rash may be itchy. The patches may look whitish. With lighter skin, the skin under the patches may look reddish. With darker skin, the skin may look darker or lighter than the usual skin color.

Seborrheic dermatitis in teens and adults is usually treated with antifungal shampoos and medicines that you put on your skin (topical medicines). If those medicines don't help, your doctor may prescribe other treatments, such as pills.

A doctor can usually diagnose this condition by looking at the rash and where it's located. You'll also be asked about your symptoms and past health. In rare cases, the doctor might take a skin sample (biopsy) to rule out other skin problems.

• Be safe with medicines. If your doctor prescribes a skin cream, shampoo, or other medicine, use it as directed. Read and follow all instructions on the label.
• If your scalp is affected and your doctor hasn't prescribed a dandruff shampoo, use an over-the-counter dandruff shampoo. You may need to try a few kinds of shampoo to find the one that works best for you.
• Leave dandruff shampoo on your hair for 5 minutes before you rinse it off.
• Ask your doctor how often to shampoo your hair. When you wash your hair, it might help to put the dandruff shampoo on your face and other affected areas.
• If you have a beard or mustache, use dandruff shampoo on these areas. You might also consider shaving. Keeping the skin free of hair may reduce symptoms.
• Don't use skin or hair products that contain olive oil.
• Avoid putting pomades and oils on your scalp. If you use them, apply them to the hair shaft instead.
• Try to identify and avoid things that make your symptoms worse. Examples include stress and cold, dry weather.
• Ask your doctor about using the treatment after the rash has improved but using it less often. This may help keep the rash from coming back.

Seborrheic dermatitis (say "seh-buh-REE-ick der-muh-TY-tus") is a skin condition that causes a rash with greasy, flaky skin patches. Dandruff is the most common and mild form of this condition. It often affects the scalp and face, especially near the eyebrows, nose, and mouth. The rash may also appear on other parts of the body, such as the ears, underarms, chest, and genital area.

In babies, this condition is called cradle cap, and it usually goes away on its own.

In teens and adults, seborrheic dermatitis 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.