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Seborrhea is a chronic skin condition of unknown origin which causes scaling, oiliness and redness of the skin, most commonly on the scalp (in which case it is often referred to as dandruff), face, ears, navel and genitals. Although symptoms imply that skin is dry, seborrhea actually involves excess oil production in the glands. For this reason, self-treatment methods such as moisturizing often prove ineffective and may even worsen the condition. Professionally recommended treatments such as cortisone creams and lotions, and reduction of yeast on the skin surface, in combination with frequent gentle washing and avoidance of harsh or perfumed soaps, can alleviate symptoms.