I have a large lump on my left axilla(armpit area) and went to the doctor and he scheduled me an ultrasound and to drain the abscess. What is the abscess ?  Is it bacteria attatched to my muscle? It hurts like no other when i move my arm causing  severe pain.  I am on sulfmethoxazole for it right now. It doesnt seem to alleviate the pain. the large lump on my armpit is about the size of a gold ball and hurts real bad when i push on it or try to grip it. Is the abscess the disease itself or did it manifest itself into my muscl e and that is what i felt?
Welcome to Chat Doctor. 1. If you are already taking Sulfamethoxazole Chat Doctor. 2. Abscess means well-defined infective collection with pain and tenderness and fever like symptoms.3. The lump in the underarm / axillary region most probably a hair follicle infection.4.However, as you are posted for ultrasound - it will assess the nature of the lesion and its source and extensions, after that a small incision and