Capillaries appear generally have two conditions: 1, such as in the plateau or other lack of oxygen areas, because of the lack of oxygen resulting in capillary hyperplasia, hyperplasia to a certain extent will cause capillaries apparent, this situation is a physiological adaptation process, is also a normal physiological changes, do not need treatment. 2, capillaries appear in the legs, this situation is usually varicose veins a, also called capillary dilation period, is due to reflux in the lower extremity veins, resulting in the blood return process part of the blood flow back to the distal veins, so its next level, that is, capillaries will appear obvious and excessive pressure. This is due to the reflux in the veins of the lower limbs, resulting in a part of blood flowing back to the distal veins in the process of blood return, causing excessive pressure in the veins, so the next level of veins, that is, the capillaries will appear obviously and thicken, this situation is a pathological change, it is necessary for further examination and treatment.