I found a tiny lump the size of a pea 6 months ago it was under the skin between my right breast and armpit. I get pain in my armpit all the time. 6 days ago i felt a pulling kind of pressure under my armpit i looked and found a large lump under the skin no pain what so ever went to gp they gave me antibiotics and booked me in with the breast clinic. Now i am on day 5 of antibiotics and the lump has got worse its bigger painful and my breast is swollen doctors are telling me they different things that are causing it but this doesnt feel right.