I recently went to the ER because my left armpit was swollen. Dr diagnosed it as a Lipoma and sent me home. Hours later, I developed a small bump on my neck and since then my armpit, neck, collar bone, and wrist have remained swollen (all on the left side). I wouldn't consider any of it painful, however my shoulder and wrist get very stiff and a bit uncomfortable. After googling it, my non-physician self, concluded maybe it's an infection in my lymph nodes. The Dr didn't examine any lymph nodes, solely focused on my armpit.
It's hard for me to say what it could be, but I do think it would be a good idea to go see your regular doctor. It seems strange to me that the ER doctor diagnosed the lump as a Lipoma without doing any sort of testing or biopsy. Possibly you do have some sort of infection, and if that's the case, you may need antibiotics.
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