There is a white mud in the nails of the scratching scalp, and this mud is the shed dander. In addition to the scales of the scalp, this white mud may be accompanied by some sebum, that is, some corticosteroids secreted by the scalp, which mixes together to form the mud. In this case, if it is accompanied by itching symptoms, you also need to take some oral antihistamine drugs, such as oral second-generation antihistamine levocetirizine hydrochloride, or loratadine. For the local scalp can use coal tar lotion topical wash, usually 3-4 days to wash once, also can use ketoconazole shampoo for hair washing, also 3-4 days to wash once. If itching is obvious, you can apply Haxenaid solution topically to stop itching.