I know that acne is supposed to be genetic, right? My mom and her siblings all had really bad acne when they were teenagers and 2 out of my dad's 4 brothers had bad skin. My skin is really clear though. I mean yea ... I get the occasional pimple during my period, but other than that my skin is really clear and i'm almost 18. There is a history of it in my family, so do you think that I still have a chance of developing acne even though i'm almost 18? I don't know if this has anything to do with it, but I spend a lot of time with track at school. Could all the running and exercise and sweating be what keeps my skin looking good? I'm just worried that all of a sudden i'm gonna have all this acne if it's genetic ...