When adolescents grow taller, their legs may have the following phenomena: 1, may be accompanied by pain in the lower limbs. This kind of pain is most obvious when sleeping at night, and some patients are accompanied by the phenomenon of cramps, which is due to the patient’s growth rate is too fast, resulting in the body’s calcium supply can not keep up, and then produce a decrease in the blood calcium level, the patient will feel soreness in the legs at night or when they are cold.2, there may be atrophic lines of the situation. The so-called atrophic lines refer to skin abnormalities similar to stretch marks, which often appear around the joints, such as the front inner side of the knee joint and the inner side of the thigh root. The main manifestation is that the skin has some longitudinal or transverse, purple or yellowish stripes, which are different from the surrounding skin texture, and there are obvious depressions. This is due to the rapid growth, the skin can not keep up with the expansion of the height, resulting in the dermis below the part of the fracture, thus producing skin abnormalities. 3, may produce the lower limbs of the body hair hyperplasia. This is particularly obvious in men, where there is a noticeable growth of body hair on the anterior medial side of the lower legs.