What is seborrhea? Seborrhea is a condition in which the sebaceous glands are hypersecretory, mainly manifesting as a greasy, oily, shiny scalp with high flaking. It can also occur in other areas with well-developed sebaceous glands. The cause of seborrhea is unknown. It may be due to the imbalance of sex hormones, especially the increase of androgen level, which increases the secretion of sebum, sometimes accompanied by neurological disorders, adrenal tumors, diabetes, etc., which also increase the secretion of sebum. Symptoms: Dry and oily seborrhea. Dry seborrhea: mainly in the head, there are grayish white fine scales, like bran, and reappear after washing the hair, dry hair, no inflammation of the scalp, light itching. Oily seborrhea: The hair and facial skin are oily and shiny, and seborrhea reappears after washing the hair. Diagnosis: Prevalent in the head of young people, showing dry fine scales or greasy, without skin inflammation. Treatment: Washing hair should not be too diligent, once a week, because the overflow of sebum and scalp sweat mixed to form a milky film, there is a certain pressure on the scalp, so that sebum is not easily discharged, and can reduce the function of sebum secretion over time; wash hair with sulfur soap or borax soda each half wash hair; internal vitamin B drugs; external use of compound sulfur lotion or Hilsen (containing selenium sulfide).