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.