People with seborrheic dermatitis should eat less oily and spicy foods and also avoid foods with high sugar content. If the dermatitis is on the scalp, it is important to reduce the number of shampoos and, more importantly, to use the right shampoo to avoid further irritation of the skin. Seborrheic dermatitis is usually found in areas where sebaceous glands are abundant, such as the scalp, face, chest and back. The lesions may appear as bright red, yellow patches of skin, as well as oily scales or scabs, and may be itchy. Of course, the symptoms of this dermatitis may vary depending on the location and severity of the damage. For example, if the lesion is on the scalp, it may appear lightly as grayish-white, straw-like scales with a slightly red base, mild itching, and hair loss. In severe cases, there will be greasy, scaly, map-like patches that ooze and develop thick scabs. If left untreated, the dermatitis may spread to the ears, behind the ears, neck and forehead, and may vanish and crack behind the ears. If it is born on the nose and nasolabial folds, dark red, oily patches may appear. The majority of patients with seborrheic dermatitis are young adults, and some newborns may also suffer from this chronic skin disease. As for the cause, it is mainly caused by excessive secretion of sebaceous glands. To prevent the recurrence of this disease, it is necessary to take care of the dietary habits and eat less fatty and sugary foods. If it is born on the scalp, we must pay attention to the shampoo used and also reduce the number of shampoos so that the shampoo does not irritate the skin and make the dermatitis worse. Patients should preferably use an emollient shampoo. Wind-heat? Damp heat? In Western medicine, the main treatment for seborrheic dermatitis is to reduce inflammation, control secretion and stop itching. In Chinese medicine, we need to identify whether the treatment is wind-heat, blood-dry or damp-heat. If it is the wind-heat and blood-dry type. In addition, the use of some external Chinese medicine treatment.