If you shave your hair, you will usually still have dandruff. The causes of dandruff mainly include seborrheic dermatitis, tinea capitis, scalp psoriasis, etc. It is necessary to address the cause of the disease, reasonable treatment to remove dandruff, and simply shave the hair, can not completely remove dandruff. 1. Seborrheic dermatitis: this disease usually manifests itself as red patches at the scalp, covered with greasy scales, accompanied by itching and other symptoms. For treatment, topical antifungal drugs can be used, such as ketoconazole, miconazole, etc.; in the case of severe inflammation, topical glucocorticoids can be used, such as hydrocortisone, etc.; in the case of severe itching, oral antihistamine treatment, such as loratadine, cetirizine, etc. 2. Tinea capitis: This disease usually manifests itself as a symptom of white scales covering the scalp, accompanied by mild itching. In the treatment, firstly, it is necessary to cut off the hair, use antifungal drugs externally, such as ketoconazole, clotrimazole, etc.; take antifungal drugs orally, such as ashwagandha, itraconazole, etc.; secondary bacterial infections, need to cooperate with antibiotic treatment, such as erythromycin, doxycycline, etc.. 3. Scalp psoriasis: psoriasis occurs on the scalp, usually with flaky white scales. At present, there is no effective treatment, and long-term treatment is needed. Topical glucocorticosteroids such as hydrocortisone cream can be used; salicylic acid ointment can be used externally; methotrexate can be taken orally to treat the disease, but the long-term use of this drug can cause extensive fibrosis of the liver and cirrhosis of the liver. It is recommended that patients go to the hospital in time to consult the doctor, diagnose the cause of the disease and follow the doctor’s instructions for reasonable use of medication, to avoid delaying the condition.