The diagnosis is based on the appearance and location of the skin lesions.

You can treat flaking and dryness with over-the-counter dandruff or medicated shampoos. Shampoo the hair vigorously and frequently (preferably daily). Loosen scales with the fingers, scrub for at least 5 minutes, and rinse thoroughly. Active ingredients in these shampoos include salicylic acid, coal tar, zinc, resorcin, ketoconazole, or selenium.

Shampoos or lotions containing selenium, ketoconazole, or corticosteroids may be prescribed for severe cases. To apply shampoos, part the hair into small sections, apply to a small area at a time, and massage into the skin. If on face or chest, apply medicated lotion twice per day.

Seborrheic dermatitis may improve in the summer, especially after outdoor activities.

For infants with cradle cap:

1. Massage your baby's scalp gently with your fingers or a soft brush to loosen the scales and improve scalp circulation.
2. Give your child daily, gentle shampoos with a mild soap while scales are present. After scales have disappeared, you may reduce shampoos to twice weekly.
3. Be sure to rinse off all soap.
4. Brush your child's hair with a clean, soft brush after each shampoo and several times during the day.
5. If scales do not easily loosen and wash off, apply some mineral oil to the baby's scalp and wrap warm, wet cloths around his head for up to an hour before shampooing. Then, shampoo as directed above. Remember that your baby loses a lot of heat through his scalp. If you use warm, wet cloths with the mineral oil, check frequently to be sure that the cloths have not become cold. Cold, wet cloths could drastically reduce your baby's temperature.
6. If the scales continue to be a problem or concern, or if you child seems uncomfortable or scratches his scalp, contact your physician. He may prescribe a cream or lotion to apply to your baby's scalp several times a day.

Seborrheic dermatitis is a  chronic (life-long) condition that can be controlled with treatment. It often has extended inactive periods followed by flare-ups.

• Psychological distress, low self esteem, embarrassment
• Secondary bacterial or fungal infections

Call for an appointment with your health care provider if seborrheic dermatitis symptoms do not respond to self-care or over-the-counter treatments.

Also call if patches of seborrheic dermatitis drain fluid or pus, form crusts, or become very red or painful.

The tendency to develop seborrheic dermatitis may be inherited. The severity can be lessened by controlling the risk factors, and by careful attention to skin care