I'm noticing that my penis sometimes shrinks in the middle and looks kind of out of proportion. It's strange because I haven't had any kind of sexual experience, although I do masturbate. This happens either after I masturbate, before taking a hot shower, or just randomly during the day when I look at it. But whenever I get an erection, everything seems normal. It's only an issue when it's flaccid. Is this something I should be worried about? Could masturbation be causing damage, or is this just a normal thing? I'm really hoping for some advice.