I have what my physician said is a cyst near my anus. It is hard, and until recently, would not pop. The doc said to get it removed, due to it's bad placement, and risk of infection. Anyway, today it appears to have popped, and out comes very smelly, white chunks of stuff. I tried to clean it up and put antibiotic cream on it. Do I need to do anything further? What the heck is this stuff, and why does it smell so bad? thank you