The white mud in the nails of the scalp may be a mixture of dandruff and dust from the scalp, as well as sebum secreted from the scalp. Most of these mud-like substances are formed due to the increase of sebum or excessive dandruff in the scalp. For normal people, even if there is no dandruff or seborrheic dermatitis of the scalp, sometimes this can occur if the hair is not washed for a long time. If you already wash your hair often and this situation still occurs, it may be formed by seborrheic dermatitis of the scalp. For this situation generally need to actively use drugs for treatment, most can be topical ketoconazole shampoo shampoo, can effectively remove the scalp dirt and scales of the scalp, at the same time can take oral anti-histamine drugs, such as loratadine.