hi there, my name is Kyle i am 20 years old, i have noticed for a while actually that there is a red vein running down the back of my penis, which is connected to the frenulum, its inflamed or its just meant to be that colour? i have never been to the doctor about it as i never saw it as a problem, it doesn't hurt or anything i just thought i would query it. also can you damage your penis with too much masturbation, and can it affect urination. sorry for all the questions.