Hi - I have tenderness and a painful stinging sensation just below the knee in the back of the upper calf of one leg. It doesn t hurt when I walk and there is no noticeable swelling, but I do see the blood vessels below the skin (not varicose). The main pain comes when I bend that knee in a certain way, or press on the area. If I don t touch it, or bump it, etc. it doesn t hurt, but I know it will in an instant if I make the wrong move. This has been going on for 3 or 4 days. Thank you.