A head full of dandruff is mostly considered to be caused by seborrheic dermatitis, psoriasis, ringworm and other diseases, and you can choose the right medication according to different diseases. 1. seborrheic dermatitis: you can use sulfur, salicylic acid and other drugs, to achieve antibacterial, exfoliation, anti-inflammatory effect; for the inflammation of the heavier cases, can be used in a short period of time glucocorticosteroid treatment, such as hydrocortisone cream, etc.; there is a small amount of exudation of vesiculosis, can be used externally with 1% revanol zinc oxidized oil treatment; there are fungal damages, can be orally anti-fungal drug treatment, such as itraconazole, etc.. 2. Psoriasis: available topical drugs such as vitamin A acid drugs, vitamin D3 derivatives (carbotriol or tacalcitol), calcium-modulated phosphatase inhibitors such as tacrolimus, etc., but also a variety of keratin contributing agents (tar preparations, anthralin ointment, comedones ointment, salicylic acid ointment, etc.). 3. Tinea capitis: after the diagnosis of this disease, can use antifungal drug treatment, such as itraconazole, terbinafine, etc.; with sulfur soap, 2% ketoconazole lotion wash the head; can also be used externally with 1% biphenylbenzyl azole solution, 2% iodine tincture of topical antifungal drugs coated with the affected area; pay attention to wash the hair diligently. Full head of dandruff may also have other reasons, it is recommended that patients diagnosed, under the guidance of a professional physician reasonable medication, not blindly self-medication.