How does seborrheic dermatitis present in adults?
| | Fig. 8.4 Seborrheic dermatitis. A, Infant demonstrating characteristic scalp seborrheic dermatitis commonly known as 'cradle cap.' B, Adult demonstrating yellowish-red, sharply demarcated lesions with greasy scale. (Courtesy of James E. Fitzpatrick, MD.) | Dandruff—visible scalp desquamation—is the precursor lesion. The scalp may become inflamed and covered with greasy scale (Fig. 8-4B). Dull or yellowish-red, sharply marginated, nonpruritic lesions, covered with greasy scales are seen in areas with a rich supply of sebaceous glands. Characteristically, the medial eyebrows, glabella, melolabial folds, nasofacial sulci, and eyelid margins (blepharitis) are involved. Preauricular cheeks, postauricular sulci, and external auditory canal lesions are also commonly affected sites. The trunk may demonstrate presternal or interscapular involvement. Intertriginous areas, such the inframammary creases, umbilicus, and genitocrural folds, are occasionally involved. Seborrheic dermatitis is one of the most common causes of chronic dermatitis of the anogenital area.
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