The white stripes on the inner thighs are considered to be expansion lines. It is due to the high secretion of adrenaline. The human adrenal cortex can secrete a glucocorticoid hormone, and this hormone can break down the elastic fiber proteins in the skin into sugar, causing the elastic fibers to degenerate and also inhibit the proliferation of fibroblasts, which leads to the breakage of the elastic fibers in the skin. When the volume of bones, muscles and fats increase more than the rate of skin lengthening, the elastic fibers of the dermis are pulled off and white lines are formed. The appearance of expansion lines does not occur in everyone, but is generally predominant in obese people. When obesity occurs, it is possible to develop expansion lines. It is common in the buttocks, back of the waist, thighs and other places. After the appearance of swelling lines, you can use some scar lightening creams, such as beauty skin care, for swelling lines are a certain lightening effect, usually pay attention to exercise, not rapid weight loss, so as not to produce swelling lines.