Itchy scalp with dandruff, may be suffering from ringworm, seborrheic dermatitis and psoriasis, etc., need to be specifically analyzed according to clinical manifestations. 1. Tinea capitis: Tinea capitis refers to the dermatophyte infection that involves the hair and scalp. It can be manifested as an increase in white scales on the scalp with itching. 2. Seborrheic dermatitis: Seborrheic dermatitis is prone to occur in the environment of the scalp oil secretion. When the oil secretion is excessive, it is easy to attract the Malassezia bacteria to multiply and decompose the oil, producing toxins. It is characterized by itchy and flaky scalp. 3. Psoriasis: Psoriasis is an autoimmune disorder, the specific cause is unknown, the whole body skin can be involved. In the head manifested as red swollen plaques, accompanied by silver-white scales off, the appearance is similar to dandruff, some patients may be conscious of itching. Itchy scalp with dandruff may also have other reasons, it is recommended to go to the hospital in a timely manner, to clarify the cause of the disease, standardized treatment.