Purple capillaries in the ankles are a sign of capillary dilation. Under normal circumstances, capillaries are not visible on the surface of the skin, but when capillaries are dilated, they are revealed on the surface of the skin. The purple color is mainly due to the fact that the capillaries are mostly filled with venous blood, and the oxygen saturation is relatively low, so the color is slightly greenish-purple. Capillary dilation is the earliest symptom of varicose veins. It is the result of prolonged standing or heavy work, as well as some special people, such as pregnant women and obese patients. Due to the loss of elasticity of the vessel wall and valve insufficiency, blood reflux accumulates in the lower extremities and increases the venous pressure in the lower extremities. Under the effect of the elevated venous pressure, the capillaries appear to be dilated. When capillary dilation occurs, it is recommended to avoid prolonged standing and sitting. Appropriate exercise to promote venous return, such as jogging, cycling, etc. Venous reflux can also be improved by oral medications, such as oral horse chestnut seed extract and calcium hydroxybenzoate capsules. If necessary, venous reflux can be promoted by wearing varicose veins stockings. If there are obvious capillary tortuous dilatation and protrude from the skin surface, surgical treatment can be performed by electrocoagulation.