noticed swelling under the armpit. it has kinda been there for a while now almost a year now. it never hurt or bothered until now. when lowering arms it seems to be kinda in the way. there does not seem to be an obvious lump only more tissue like there is more fat under left underarm. lately it feels more tender too. checked for lumps but doesnt look like there is any only a more solid area deep under the skin. very nervous.