Redness of the scalp and dandruff are mostly likely to be seborrheic dermatitis and possibly scalp psoriasis. Seborrheic dermatitis is related to more sebum secretion in the scalp, and the dandruff manifests as greasy yellow dandruff. Treatment can be topical topical selenium disulfide lotion, while oral vitamin B complex, avoid eating spicy, irritating food, greasy food and sweet food, so as not to increase sebum secretion and aggravate the condition. Scalp psoriasis has the typical three characteristics of psoriasis lesions, and at the same time there are also bundles of hair, the treatment can be topical application of Sigma or Darex, and can also be given oral treatment of anti-silver granules or compound Qing Dai pill.