Help with Cyst (Staph Infection) in my arm pit.?

Okay, so not too long ago I was diagnosed with Staph Infection, I have a rather uncomfortable, LARGE LUMP under my armpit(most likely from shaving) and it doesn't have a "head".. My question is will it go away if I only treat it with antibiotics, or must I pop it? And if I were to "pop" it, what will make it have a head to pop, because right now it's just a sore lump...