The possible causes of dandruff are seborrheic dermatitis, psoriasis, ringworm, etc., which can be improved through enhanced care and medication. 1. seborrheic dermatitis: seborrheic dermatitis is a kind of chronic skin inflammation that occurs in the head, face and other parts of the body, which can show symptoms such as furfuraceous scales on the scalp, greasy yellow or brown scabs, etc. Such patients can use ketoconazole, biphenylbenzazole lotions or creams locally to help improve the symptoms, and the serious ones need to take tetracycline, roxithromycin and other medicines to help treat the disease orally at the same time. 2. Psoriasis: psoriasis that occurs in the scalp area can also show the symptoms of dandruff initiated by the head and accompanied by red papules and plaques in the scalp area, etc. Such patients can be locally coated with Tazarotene Gel, Carbotenoids Ointment, Tacrolimus Ointment and other ointments to improve the symptoms, and the serious ones also need to take drugs to control the condition such as Avicenna, Vitamin A, Vitamin C, etc. 3. ringworm of the head: ringworm of the head in the white ringworm can also cause patients to appear hair dandruff symptoms, but also accompanied by hair loss, itching and other symptoms, can be used topically salicylic acid ointment, terbinafine cream and other antifungal treatment, with ketoconazole lotion, selenium sulphide lotion shampoo wash hair can also help treatment, the serious need to be orally at the same time terbinafine, itraconazole and other drugs. The use of the above drugs should strictly follow the doctor’s instructions. It is recommended that patients consult a doctor in a timely manner to clarify the cause of the disease and standardize treatment under the guidance of a physician to avoid the occurrence of adverse reactions.