question: Hi! Recently i noticed a lump under my upper arm skin. It is the size of a chickpea. It was painless for two days, but it's sore and painful now. My left shoulder is sore and there is tinglings in my left hand. the pain is spreading towards my neck and left side of the face. It's not intolerable but my left torso feels strange , i.e sore, numb and feels bruised. I'd be grateful if you could give me a diagnosis . Many thanks, Leyla