Scalp area can pick out a large piece of skin that scalp area has scales, may be due to seborrheic dermatitis or psoriasis, you can follow the doctor’s instructions reasonable use of medication to treat. 1. seborrheic dermatitis: due to scalp infection with chaffersporella, scalp scales can appear, follow the doctor’s instructions in the scalp coated with ketoconazole cream or miconazole nitrate cream, you can also use ketoconazole shampoo shampoo antifungal treatment. 2. Psoriasis: when suffering from psoriasis, there may be large pieces of scales on the scalp, you can follow the doctor’s instructions in the scalp coated with carbotriol application to control the immune-inflammatory reaction. It is recommended to go to the hospital to clarify the causative factors and then receive standardized treatment according to the doctor’s advice.