Regarding acne, I find part of my problem is that I fidget on amphetamines. I mean I have these weird habits that I get into when I focus intently on something -- I'll rub my neck or face or play with my stubble or something. In fact for like 4 months when this all started I couldn't figure out why I kept getting rashes on the back of my hand whenever I was on a run. I thought it was some weird toxic reaction to high levels of amphetamine or something.Turns out it's because I was rubbing my stubble with the back of my hand for 2 days straight. ::)