From my experience, they are probably just cysts. I've had a few on
I went to a dermatologist, and
he removed one for me in his office. They come from oil buildup in a hair folicle or under the skin, I tend to get them in all sorts of places, and one of my parents gets them, too. Sometimes they'll go away on their own, but not always. If they are bothersome, go to a dermatologist and he'll take care of them for you.