Dry itchy scalp dandruff, consider seborrheic dermatitis, folliculitis, ringworm and other diseases caused by the need to promptly identify the cause of the targeted treatment. 1. Seborrheic dermatitis: a common chronic inflammatory skin disease, especially in the scalp area of the skin, can lead to the scalp area of the skin erythema, and erythema can be covered with a layer of greasy scales or scabs. Therefore, it causes patients to increase dandruff and dry itchy discomfort. 2. Folliculitis: the scalp part of the hair follicles are more, once the local hair follicles are blocked by sebum or bacterial infection, can induce the appearance of folliculitis. Scalp folliculitis can lead to itchy scalp and dandruff increase phenomenon, due to repeated stimulation of inflammation, serious can also trigger the phenomenon of hair loss. 3. Tinea capitis: when the head skin is infected by dermatophytes, it can lead to infectious skin diseases, such as the appearance of tinea capitis. Often cause patients scalp itching, alopecia, scaly lesions and other manifestations, and even can also trigger ringworm, ringworm, etc.. So once the phenomenon of dry itchy scalp dandruff, it is recommended to go to the hospital in time to find out the cause of the disease, under the guidance of the doctor for treatment.