Thigh root hyperpigmentation is mostly caused by obesity, lack of vitamins and hyperpigmentation, etc. The main ways to remove it are weight loss, vitamin supplementation and laser treatment. 1. Obesity: patients because of obesity makes the leg fat, walking leg skin repeatedly rubbing each other, resulting in the skin wear and tear necrosis and hyperpigmentation, you can use fabric barrier to prevent friction, in addition to the need to reduce body weight to avoid friction, pay attention to the overweight patients do not take a short period of time to quickly reduce body weight, to avoid the skin can not be restored to relaxation. 2. Lack of vitamins: especially the lack of vitamin C, E and so on, easy to lead to the accumulation of pigment on the skin surface, the patient often in addition to hyperpigmentation of the legs, in the armpit or elbow area there will also be the accumulation of pigment, you can usually supplement apples, bananas, kiwi fruit and other fruits to replenish the vitamins, you can also comply with the doctor’s instructions to take multivitamins to replenish. 3. pigmentation abnormalities: if dermatitis, ringworm and other causes of post-inflammatory hyperpigmentation, you can remove hyperpigmentation by laser. Thigh root hyperpigmentation may also have other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.