There are a lot of red blood vessels on the legs. What's going on?

There are a lot of red blood on the legs. First of all, it is considered that due to the recent cold or overheating weather, the blood circulation in the legs is affected, causing vasodilation, which is a normal physiological phenomenon. Secondly, varicose veins in the legs, after pregnancy, etc., will cause poor blood circulation in the legs, which will also cause the symptoms.