Hi Student,
I am keeping my SD under control (it is not visible any more)just by washing my face and scalp with sulfur 2% soup bar. You can buy online or somewere else for 10 buks for 5 items or so. Simply cure, aplly the soup and do massage for a couple of minutes and rinse. In the begining do it many times a day, later once a day would be enough before sleep.