it might just be a phlegmon or abscess
. A phlegmon is a fluid-filled, compartmentalized infection. You would treat it with
hot compresses (not too hot, but very warm) and draining, and Persagel. I think it's better than antibiotic ointment, although antibiotic ointment is better than nothing.
Try to avoid putting pressure on it when you sit or lie down. You may be able to get rid of it yourself, but if you can't after a few weeks, I would see a doctor because it may be a cyst.