I don't know since when I have this problem, I never noticed but few years back I saw crazy veins in my left foot (internal side) from toe to ankle. And now more I notice more severe they seem to be although there is no bluish skin or itching but sometimes I do feel like numbness or burning sensation in my left foot after prolonged standing. The vein is really getting messier and thick. Some of them I have noticed behind my knees in both legs and some in quads. My major concern in the one in my left foot and the one near my right knee. I have a history of rheumatic fever for which I was prescribed disprin (9-12 tablets/day) and penicillin for few months and later penicillin was continued for 10 years by doctor's advise. My treatment for rheumatic fever got completed by 2013-14. Now i'm 25 and worried about this new condition.