I switched long ago from burning to banging my head on hard surfaces. The pain is more intense than any burning or cutting and it does not leave scars. Yes you get a lump and if you hit your forehead a bruise can show up but that is easily explained away. I have never knocked myself out. I do resort to punching myself during times of extreme stress and have given myself a black eye. Still easy to explain away. I am glad to report I have not had to self harm in several weeks.