The most common reason for 16-year-old girls to have oily hair and great hair loss is seborrheic dermatitis, which is mainly intervened by two methods of medication and general treatment. 1. medication: you can use shampoo containing ketoconazole to wash your hair, can be very good antifungal, anti-inflammatory, inhibit the formation of scalp lipids, etc., with the use of topical glucocorticoid ointment, such as mometasone furoate, hydrocortisone butyrate, etc., but also oral vitamin B2, vitamin B6 and other drugs. 2. General treatment: patients should maintain a regular routine, ensure adequate sleep, light diet, avoid greasy, high sugar, spicy stimulating food intake, strengthen the scalp area of oil control and moisturizing, avoid excessive cleaning of the scalp. Patients with hair oil and hair loss symptoms are serious, it is recommended to go to the hospital in a timely manner, under the guidance of the doctor to use medication, do not blindly self-medication.