Abscess in armpit

Hey,

I had a swollen red lump and it got open by itself and have drained pus and blood. I have two small red pea sized lumps after two days. 

Is it common to have this ? 

I am using antibiotics. 

Other sysmptoms I have is teeth ache , fatigue , feels like swollen tonsils under jaws and neck  but nothing outside, light throat pain when Swalloing . 

What could this be ? 

This is the first time I am experience this and feels a bit weird .

My doctor told me to take antibiotics