Re: Staph infection found inside of a breast cyst???? How???
Honestly, sometimes people just get infections in/under the skin that form cysts. Staph is out there, it's on your skin, it's in your nose, it's everywhere. Most of the time, your body's natural defenses keep it under control, once in a while something gets through.
It's been several months and hasn't returned, so I don't think you need to worry. You did exactly the right thing getting it drained ASAP.
Of course, if you get any other bruise-looking lumps, get those looked at soon too.