Seborrhea

 Seborrhoea, or seborrhoeic dermatitis in its later stages, is a common disorder of the scalp that causes too much oil to be produced, dandruff, and itching. When sebaceous glands make too much sebum, it makes the skin greasy, which makes white or yellowish flakes fall off. Stress, hormonal changes, changes in the weather, or the growth of fungi, especially Malassezia yeast, might make this disease worse.

Seborrhoea isn't dangerous, but it can be uncomfortable and embarrassing because of the flakes and irritation on the scalp. Common symptoms are a greasy scalp, itching, and flaking that can spread to the eyebrows, beard, or behind the ears.
Management is mainly about keeping too much oil under control and lowering fungal activity. People often advocate medicated shampoos that have zinc pyrithione, ketoconazole, or selenium sulphide in them. Regularly cleaning your scalp, using mild products, and staying away from harsh hair products will also help keep flare-ups from happening. In more serious situations, doctors may prescribe antifungal or topical corticosteroid treatments.