hi, im a teenager and i have recently noticed a weird dot on my penis, i've seen it before but this time it caught my attention, its barely noticeable and looks like a beauty mark, it is unevenly shaped and has a brown color, it doesnt itch or hurt or anything. i tried to gently rub it off but it doesnt appear to be a clot as i first thought. it is really small but stretches when erect. its located on the 'stem' of my penis. im really worried about it and embarrassed to tell my parents. please advise me..