What could this be: Hard painful pea-sized lump under skin?
I have had for over a year now. Lump under skin of fatty part of skin under right arm, not in the armpit though. Hard, pea-sized, none movable, sharp pains surrounding area if stretch skin out, very sharp/burning pain to the touch, no head noted in center, discoloration of skin on area red-purple, skin color changes at times. I have pictures, unsure how to attach.