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Summary Seborrhea is a problem which ought to be corrected in view of its inacceptability for aesthetic reasons as well as for the complications which can follow, particularly those of acne. The medical treatments of seborrhea are not entirely satisfactory. Products for treating seborrhea do not give complete satisfaction due to secondary effects. When the dosages employed are sufficient to have an effect they are also contraindicated, especially in the female. Cosmetic treatments have considerable benefit and are completely innocuous. The treatment of acne is based on the inhibition of bacterial colonization of the pilo-sebaceous follicle (tetracycline, erythromycine and benzoyl peroxide) as well as by treatments which modify keratinization (vitamin A acid as well as salicylic acid and resorcin). Yeast infections appearing on oily skins are easily treated by classic fungicides. These two diseases associated with oily skin recur continually and require a maintenance therapy.