my left testicle is much larger than my right, eg: left testicle is like a golf ball, right testicle is like a marble.The thing that worrys me the most is that undernaeth the left testicle it is hard! i think it could be to do with an std or something, because a year ago i had a discharge coming from my penis but it went within a couple of days so i didnt think much of it, your help would be much appreciated.