Male leg hair is usually a sign of strong secretion of androgen, but may also be related to genetic factors. 1. Male leg hair is a normal physiological manifestation, and there are individual differences in thickness or sparseness. When entering puberty, with the rise in hormone levels, there will be an increase in body hair and other physical characteristics. General androgen secretion of boys, leg hair or other parts of the body hair will be more exuberant. 2. In addition, the factors affecting the boys leg hair exuberance may also be related to genetic, geographical and ethnic factors, such as the Mediterranean population in the phenomenon of hair is more common. If there are no abnormal symptoms of hair, usually no special treatment is needed. If excessive hair affects normal life, you can go to the hospital for treatment under the guidance of a professional doctor.