Too much dandruff and crusting may be a symptom of seborrheic dermatitis, scalp psoriasis or ringworm of the scalp, which can be treated with medications such as glucocorticosteroids and antifungal drugs. Dandruff is produced by the metabolism of the scalp skin and is usually a normal physiological phenomenon. If the dandruff is too much and accompanied by crusting, it is usually caused by disease. If the scalp can be seen in the erythematous base, dandruff is furfuraceous scales, accompanied by intense itching, most of the consideration for seborrheic dermatitis. Shampoos containing selenium disulfide, ketoconazole, and zinc pyrithione can be used to wash the hair. If the scalp can be seen clearly bordered red plaque, scalp scales gathered when the hair in bundles, scales scraped off the visible film, it is most often considered for scalp-type psoriasis. Topical glucocorticoid preparations can be used, such as hassanide solution and tretinoin application. If the scalp crusts are yellowish thick crusts, the hair is dry and lusterless, thin and easy to break, accompanied by itching, pain and special rat odor. Mostly considered as ringworm of the scalp, can use antifungal drug treatment, such as itraconazole, terbinafine, fluconazole and so on. The above are the possible causes and treatments for excessive dandruff with scales, it is recommended to diagnose the condition by a doctor and follow the doctor’s instructions for medication.