Inflammatory Dermatologic Diseases Seborrhea

Seborrheic dermatitis is a chronic inflammatory disorder affecting areas of the head (scalp, face) and body where sebaceous glands are prominent. The inflammation is thought to be caused by Malassezia (Pityrosporum) species. All age groups may be affected, and seborrhea can be chronic or intermittent. On the scalp, seborrhea can range from mild dandruff to thick, adherent plaques. Seborrhea on the face and body appears as greasy scales in skin folds and along hair margins, with a symmetric distribution bilaterally. On the face, two common locations are around the eyebrows and around the beard and mustache in men (Fig. 33-16 and 33-17)

Treatments are aimed at the inflammation and the Mal-assezia overgrowth and include shampoos containing selenium sulfide, ketoconazole, or pyrithione zinc that target the fungus. Topical antifungal lotions and corticosteroid preparations are also effective. Low-potency corticosteroids used intermittently are safe and effective. In infants, seborrheic dermatitis might only involve the scalp (cradle cap) or can be seen in other areas of skin folds such as the diaper area. If not treated prophylactically, seborrheic dermatitis has a tendency to recur.

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