Dandruff on the head of a piece of consideration and scalp chafing rash, psoriasis, seborrheic dermatitis and other related. 1. Scalp furuncle: it is the occurrence of bran-like or powdery dry scales on the scalp, which is mainly related to pathogenic bacterial infection, sebaceous gland secretion and genetic factors. It is usually characterized by the appearance of round or irregularly shaped lesions on the scalp, accompanied by bran-like dry scales. 2. Psoriasis: It is a chronic scaly skin disease caused by the interaction of many factors, mainly related to environmental factors and immune factors. It is usually characterized by scaly erythema, thick accumulation of scales, etc., which will lead to the appearance of a piece of dandruff on the head. 3. Seborrheic dermatitis: a chronic inflammatory skin disease that occurs in seborrheic areas, mainly related to genetic factors, microbial factors. It is usually characterized by erythema and greasy scales on the scalp. Therefore, when the symptoms of dandruff on the head of a block, it is recommended to consult a doctor in a timely manner to identify the cause of the symptomatic treatment, to ensure that during the treatment period of life and work and rest regular, light diet, avoid smoking and avoid alcohol.