How to get rid of them largely depends on what is causing them and your skin type. Sometimes stress or a change in diet or exercise can cause a break-out like that. Most products don't do much for me, or if they work, they are so harsh and irritating I just don't want to go through with them.
However, I had a friend recommend two things from LUSH for me and I was really surprised it actually worked. Check and see if there's a store where you live, because they will give you free samples.
1. First, use an exfoliant or scrub. I prefer Dark Angels, but there's a few other ones depending on your skin type. DA has charcoal in it which is nice at absorbing oils that can cause a lot of breakouts.
2. Grease Lightning
: Seriously, just a dab of it on after you've washed the area and a lot of the acne problems just go away. It took about three days for mine to seriously diminish. As long as I keep up with exfoliating and putting a dab of it on over the area, I have next to no breakouts, and ones that do pop up disappear before they turn into face-volcanoes.
Also, best thing about this stuff is it doesn't burn. At all. Also it doesn't have enough alcohol in it to clear my sinuses out when I use it.