I just discovered a large area of numbness in my left armpit. It's centered in the armpit and is a little bit on the side of the left breast. No other abnormalities noted. Feel no nodes, see no rashes, open areas, redness or anything else of concern. I have arthritis in L-5 and L-6, and I have a nerve that is pinched in that area, but nothing above it has given me problems. Can you help?