Purple legs are often caused by overly dilated capillaries and local vascular rupture, as follows: 1. Overly dilated capillaries: Commonly found in varicose veins of the lower limbs, which can be examined by general surgery or vascular surgery at the hospital. If the varicose is not too serious, don’t worry too much, usually you can wear varicose socks and reduce the sagging, which can slow down the discomfort symptoms. If the varicose is serious, it needs to be treated by surgery or injection of drugs; 2. Local vascular rupture: It may be caused by the rupture of blood vessels below the local tissue, often caused by the leakage of blood to the skin below, which can be examined by the general surgery department or emergency department of the hospital. If the bleeding is not much, you can apply some topical bruising drugs to help absorb the bruising. If the bleeding is more serious, further tests, such as routine blood tests, coagulation tests, ultrasound, etc., are needed to identify the specific cause.