and this would be a pic of an abscess and some more info
Abscesses are more familiar - at least in term - to most bodybuilders because most have had one at least once at the site of an injection. An abscess is simply a localized collection of pus and fluid in any part of the body, that is caused by infection. They occur when an area of tissue has become infected, and are the body's way of sort of sequestering or walling off the infection to prevent spreading. A pustule forms, which is a combination of white blood cells that have rushed to the area, dead tissue, and bacteria or infection derived from foreign invasion. Most abscesses are septic (red, swollen, painful and caused by an infection) but some are sterile (caused by non-living irritants such as drugs). So when you inject a steroid and it stays in that injection pocket and does not absorb into the body, it can become a sterile abscess. These solid lumps often scar and remain. But a septic abscess can spread to other tissues and even enter the blood stream and cause blood poisoning (septicaemia) which can be life-threatening.
You must open and drain most abscesses. That's because, unlike most other infections, antibiotics alone won't take care of a well-developed abscess. On rare occasion an abscess will drain on its own, but generally it must be cut open by a doctor and drained. Packing material will then be placed in the void and remain in the cavity.