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Large painful lump under arm
Almost 18 months ago I was visiting a hospital patient and had my arm extended with the armpit on the bed rail for hours holding her hand. That night what appeared to be a muscle under my arm was very sore and painful and huge in size. I used a heating pad and it began to feel better but has flaired up several times since then. It's as big as a baseball at time and never goes away completely. When its at its worst I tend to feel like I have a fever.
You may have injured a blood vessel. They can become inflamed. It would be best to have it checked. I'm guessing if it was a clot, you would have had some other symptoms by now like neuropathy (tingling) or color changes.
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