I'm 35 and I still get the occational face pimple if I don't regularly use Oxy, or I'f I'm stressed, or if I've caused any irritation to my face. I also get moderate bacne during the winter.
If your bacne gets worse during the winter, try going to a tanning bed twice or three times a week for just 10 minites or so each session. Don't try to get a dark tan or anything, just a normal amount of sunlight like you would get in the summer. If you can, go to a salon with stand up booths. Laying down on your back on hard plastic, stewing in your own sweat will just irritate your skin further.
Whatever you do, do NOT scrub or scratch your back. Don't pop any pimples with the exception of blackheads. This only causes irritation and makes it worse. Pimples come in clusters because we pop them, rub them, scratch them and scrub them and irritate the surrounding area... causing even more pimples.