Scalp has a large dandruff crust, the reasons include cleaning is not in place, should wash the hair every day diligently and take a shower; ringworm caused by the crust, should use drugs antifungal treatment. 1. cleaning is not in place: in some cases, the phenomenon of dandruff large pieces of scabs, and their own cleaning is not in place, is not a manifestation of certain diseases, daily life is recommended to wash your hair diligently and take a shower, maintain personal hygiene, neatness, can reduce the appearance of dandruff scabs. 2. Tinea capitis: some fungal infections caused by hair loss, scalp itching, redness, dandruff, large pieces of scabs and other manifestations, you can use itraconazole, terbinafine hydrochloride and other drugs for antifungal treatment, is suitable for the treatment of fungal dermatosis, adverse reactions include elevated liver enzymes, allergy is contraindicated, the above drugs need to be used under the guidance of a doctor. The phenomenon of large dandruff and large crusts on the scalp should be promptly consulted to identify the cause of the disease.