Purple capillaries in the thighs are obvious and may be caused by the following reasons: First, varicose veins: varicose veins are a common disease caused by damage to the valves in the blood vessels and damage to the muscles in the walls of the blood vessels, and there will be obvious vasodilation locally. If the condition is not serious, varicose veins can wear varicose socks to relieve pain and discomfort, and patients can also take oral Chinese medicine to help treat the condition. If the condition is more serious, it needs to go to the hospital for local sclerotherapy, laser treatment or surgery. Secondly, thrombosis: it may be caused by the local formation of thrombus, need to go to the hospital to check the lower extremity ultrasound or angiography, etc. to clarify. If it is the disease, it needs to be treated with dilation, de-agglomeration, anticoagulation, etc. If necessary, it also needs to be treated with thrombolysis. During the treatment period, do not drink drinks containing alcohol and do not eat greasy food, etc.