Scalp itching accompanied by dandruff is considered to be either seborrheic dermatitis or psoriasis of the scalp. The dandruff in seborrheic dermatitis is greasy dandruff, which is related to the high sebum secretion of the scalp, leading to Malassezia infection. The main treatment is to avoid eating spicy and irritating food, fried food, puffed food, sweets, chocolate, cocoa, etc., so as not to increase the sebum secretion of the scalp and aggravate the skin lesions. Also need to pay attention to rest, avoid tension, anxiety. Topical ketoconazole lotion or selenium disulfide lotion can be used topically 1-2 times a week, and oral antihistamines such as loratadine or cetirizine with vitamin B can be taken for obvious itching to help reduce dandruff. Psoriasis of the scalp is characterized by silvery-white flakes that peel off easily, and the hair can be in distinct bundles. Topical treatment can be given with Sinequan or Darex application, while avoiding upper respiratory tract infections, avoiding frictional stimulation and avoiding spicy and irritating foods.