Sahlgrenska University Hospital, Gothenburg, Sweden
Dandruff and seborrheic dermatitis are often mentioned together. Dandruff is the mildest manifestation of seborrheic dermatitis and it cannot be separated from seborrheic dermatitis. Therefore, what is mentioned in the literature for seborrheic dermatitis is also true for dandruff and vice versa. Seborrheic dermatitis is characterized by inflammation and desquamation in areas with a rich supply of sebaceous glands, namely, the scalp, face, and upper trunk (1). It is a common disease and the prevalence ranges from 2 to 5% in different studies. It is more common in males than in females. The disease usually starts during puberty and is more common around 40 years of age. Seborrheic dermatitis is characterized by red scaly lesions predominantly located on the scalp, face, and upper trunk. The skin lesions are distributed on the scalp, eyebrows, nasolabial folds, cheeks, ears, pre-sternal and interscapular regions, axillae, and groin. Around 90 to 95% of all patients have scalp lesions and lesions on glabrous skin are found in approximately 60% of the patients. The lesions are red and covered with greasy scales. Itching is common in the scalp. Complications include lichenification, secondary bacterial infection, and otitis externa. The course of seborrheic dermatitis tends to be chronic with recurrent flare-up. A seasonal variation is observed with the majority of patients being better during the summertime. Mental stress and dry air are factors that may aggravate the disease. A genetic predisposition is an important factor. Seborrheic dermatitis is seen more frequently than expected in
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