at the base of the glans mainly on the top side of the penis, where they behind and it goes from shaft to head and you know theres like the part of skin that sticks out? the base of the helmet if u will. ive noticed through jelqs, stretching, v-jelqs, the constant rubbing against it has created kind of a lip on that part like it kind of folds up now instead of being perfect. idk if what i said makes any sense at all, but is that normal or permanent or what can i do to stop it? push back and hold the skin down after im done?