Hi. Over the last 9+ months I have been getting a strange sensation in my armpit and down the side of my breast. I was referred to hospital where after a 5 minute chat and examination was told I have nothing to worry about. This has never really gone away but I had some pain under my nipple area on Friday and on examining myself there is a lump. Probably a bit bigger than pea sized but it seems to go quite deep as I can't get my fingers around it.(if that makes sense). Should I be concerned??