Hair growth at the root of the thighs can be treated by a dermatologist or endocrinologist. Thigh root hair growth may be a change in the state of the skin, some diseases or etiology can cause the result and function of the skin to be disrupted, causing changes in the microenvironment of the skin, which can lead to ectopic growth of hairs. This is a dermatologic condition and can be treated in a dermatologist. It may also be purely hereditary, with parents having heavy body hair and their children having heavy body hair in a physiologic state, which can be improved by phototherapy in the dermatology department if needed. In addition, in certain pathological states, such as hirsutism, polycystic ovary syndrome, etc., will lead to endocrine hormone level abnormality, the growth of hair in any part of the body, shedding is the participation of hormone regulation, resulting in the emergence of the root of the thighs long hair. Thigh root hair should be timely to the regular hospital dermatology or endocrinology for diagnosis and treatment, clear causes, symptomatic treatment, so as not to delay the development of the disease.