I didn't see a thread for this but felt it important with the number of people shooting IM or SC. If there is an infection, the area will be warmer then your normal skin. Sometimes it will clear on its own, but usually more advanced care is needed. You can use a 5-10cc syringe with a 1.5" 20 guage needle to insert and pull back to srain. it may help to add a little saline first and clear all air as air compresses and expands easier and the little fluid will help pull the abscess fluids out (anywhere from brown to an almost white/yellow. This beats going to the doctor where they will use a scalpel. In addition, you should go on antibiotics as soon as you feel a warm infected spot. Usually the infection is either strep or staph. Depending on strain you can use anything from amoxicillian to cephloxan to Cipro, but all are available through veteranary supply houses labeled for aquarium (or sometimes bird) use only. Don't worry, its the same stuff you'd get from the corner drug store. Even if you drained it well, a few days after the antibiotics start to work, theskin will open on its own and drain. SWIM keeps a surgipad over the spot wrapped in nylon ace bandage sort of material, so when it starts leaking, you dont have a 6" circular stain on your pants. Be smart, be safe, and if SWIY is going to shoot pills, be prepared in advance for the negative possibilities!