Scalp itching dandruff more causes are scalp ringworm, dandruff bacillus, seborrheic dermatitis, physiological reasons. 1. Tinea capitis: because the scalp is exposed to pathogenic dermatophytes, resulting in scalp infection, clinical symptoms such as itchy scalp and dandruff may occur. 2. Dandruff spores: a kind of scalp fungus, but generally will not cause harm to the hair, will be in the case of decreased immunity will make the scalp metabolism accelerate, and excessive secretion of scalp oil will appear dandruff. 3. Seborrheic dermatitis: associated with Malassezia colonization, lipid increase, impaired skin barrier function, immune response and individual susceptibility. The hair is dry and the scalp often has oily secretions, resulting in an itchy scalp and excessive dandruff. 4. Physiological reasons: such as seasonal changes in the body’s immunity to decline, metabolic changes, there may be some dandruff more itchy phenomenon. Dandruff is more obvious can use compound ketoconazole shampoo liquid external wash. If you exclude physiological reasons, please ask the doctor to clarify the specific consultation, if necessary, relative treatment.