Thick dandruff on the scalp is considered to be caused by seborrheic dermatitis, psoriasis and the use of shampoos containing unsafe ingredients, treatment can be given to daily care and medication. Seborrheic dermatitis: For dandruff caused by seborrheic dermatitis, it is important to maintain a regular life, get enough sleep, and adjust the diet, make sure not to eat spicy and stimulating food, and avoid excessive cleaning and friction. At the same time, use a mild shampoo and moisturizer, and use antifungal medication, such as itraconazole or terbinafine, under the guidance of a doctor. Psoriasis: For thick dandruff on the scalp caused by psoriasis, you can use selenium disulfide to clean it externally, captopanol to apply it externally, and if necessary, you can use oral treatment such as Avianol. For dandruff caused by the use of shampoos containing unsafe ingredients, stop using such shampoos immediately, dandruff symptoms may improve after a period of time, you can also use medicated shampoos with safe ingredients under the guidance of a doctor. The above medication should be used in accordance with medical advice. It is recommended that patients go to the hospital in a timely manner, after a clear diagnosis, under the guidance of the doctor for symptomatic treatment.