Dandruff on the head may be a manifestation of seborrheic dermatitis. Of course, seborrheic dermatitis has the highest probability of occurrence, and it is an inflammatory reaction due to allergic factors or increased cortical overflow or disorders of immune function and endocrine function in the body, which leads to a local increase in oil in the scalp and subsequently an increase in dandruff. Of course, besides seborrheic dermatitis of the scalp, there is also a possibility of psoriasis of the scalp, which also causes a large amount of dandruff. There are also fungal infections of the scalp, such as leucoderma, which can also present with a large amount of scaling of the scalp. So, all these writing aspects need to be identified.