Since it is difficult for the general public to judge the difference with the naked eye, it is recommended to go to the hospital and ask a professional doctor for an evaluation. Dandruff may be a normal physiological phenomenon, or it may be caused by seborrheic dermatitis, tinea capitis and other pathological reasons. Normal dandruff belongs to the skin’s physiological metabolic process, about every 28 days to renew, this produces less dandruff, and even will not be easily detected, the general use of anti-dandruff shampoo often wash the hair and scalp, can be significantly improved. And belongs to the pathological dandruff, mainly suffering from certain diseases such as ringworm of the head, seborrheic dermatitis or scalp furuncle, etc., leading to the process of accelerated scalp metabolism, which can shorten the metabolic period, resulting in an increase in dandruff. In addition, in addition to massive dandruff, other symptoms of tinea capitis include the appearance of ring-shaped itchy red spots, damaged hair follicles and hair loss, and in severe cases, the infected area will become pus, and even cause secondary infections, which is an infectious disease. It is recommended that those with detailed symptoms seek medical attention in a timely manner.