Hair oil has a long time without washing, metabolism and other physiological reasons, but also seborrheic dermatitis and other pathological reasons, you can often wash, pay attention to diet, medication and other methods of treatment. 1. Frequent cleaning: hair oil and sebaceous gland secretion has a relationship, can be relieved by frequent cleaning method, you can choose to go to the oil effect of good shampoo. 2. Lifestyle regulation: in normal life, pay attention to avoid eating spicy stimulating or greasy food, can eat more fresh vegetables and fruits, keep the bowel movement, in addition to develop good habits, do not stay up late, keep a happy mood. 3. medication: if the patient has seborrheic dermatitis, you also need to use medication, you can use selenium disulfide lotion to wash the scalp, this drug has the role of inhibiting bacterial growth. If there is a combination of fungal infections, you need to use antifungal medication, such as ketoconazole, econazole and so on. If the situation of hair oil is too serious, you need to go to the hospital in time, under the guidance of the doctor, if you need to use drugs should be used under the guidance of the doctor, avoid self-medication.