this small patch of dry, flaky, and reddish skin showed up on the head of my penis a couple of weeks ago.It hasnt gotten any worse but hasnt shown many signs of going away. Its been a year since ive last been sexually active. it doesnt hurt or itch at all. i regularly masturbate with lotion but have stopped until i figure out what this is. Could this be any std or infection? how do i take care of it? should i remain sexually inactive?