Hair love oil may be affected by the environment, diet, late at night, heredity and other physiological factors; may also be suffering from seborrheic dermatitis of the scalp, androgenetic alopecia and other diseases. 1. Physiological factors: if a long time in a humid and hot environment, often eat greasy and spicy food or stay up late, will lead to an increase in scalp oil secretion, so that the hair love oil; secondly, sebum secretion will also be affected by the parents’ genetic factors. If the sebaceous glands are well developed, it is easy to cause hair to be oily. 2. Seborrheic dermatitis of the scalp: Hair is oily and may be caused by seborrheic dermatitis of the scalp. If there is a Malassezia infection of the scalp or frequent alcohol abuse, eat spicy and stimulating food, it is easy to induce seborrheic dermatitis of the scalp, the patient will appear localized greasy, flaking and other symptoms. 3. Androgenic alopecia: If the patient’s body androgen level is abnormal or affected by the parents’ genetic factors, it may induce androgenic alopecia, making the patient’s hair oily. After excluding physiological factors, patients with oily scalp are advised to consult the dermatology department of the hospital in a timely manner and choose the appropriate treatment method under the guidance of the doctor after clarifying the cause of the disease.