I have noticed a red line on the underside of my penis that looks like a kind of scar. I have no recollection of any operation on my penis. Is the red line related to masturbation?
It's only related in the sense that it's on your penis, and you use your penis when you masturbate. My guess is that you're referring to the raphe, which is the "seam" that forms when the two halves of a male fetus's genitals close up while he is developing in utero. Often the raphe is more visible on the scrotum, but in a lot of guys it extends along the underside of the penis as well.
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