Capillary dilatation in the legs of women may be caused by physiologic factors, but if it persists for a long time without relief, it may be caused by diseases such as Van Lohuizen syndrome. Normal human capillaries throughout the body skin surface, in the increased activity, temperature rise and other physiological conditions, capillary network in the blood capillaries and other structures open, can appear on the skin surface, reticular or dendritic distribution of capillary dilatation performance, which is the body to adjust the body temperature and back to the cardiac blood volume of an important way, usually after calm or rest, will be relieved. However, if there is a long-term irregular network or dendritic distribution of purple-red spots on the skin of the lower limbs, not higher than the skin, the pressure of the discoloration, lesions, occasional pain and other manifestations of capillary dilatation, may be congenital dilated capillaries due to marbled dermatosis, also known as Van Lohuyzer syndrome, a benign disease. It is a benign disease. It is recommended to pay attention to warmth, wear loose clothing and pants, and follow up with regular visits to the doctor, and if necessary, pulse dye laser treatment.