Earlier today I noticed my armpit looked swollen. I noticed when I pressed on the area it hurt. It felt like a bruise. I left it alone for some time then looked at the area again & it looked like there was faint redness. As the day has progressed I've had other feelings of discomfort. My shoulder aches & has a heavy feeling. The swollen area of my underarm now has a constant achy pain with a burning sensation. Pain is also intermittently radiating into my chest. (In hindsight I noticed these discomforts were present before I noticed the swelling) For the most part it sounds like a swollen lymph node but I don't feel a knot like others seem to describe. There's no cyst-like mass; it's just swollen. I have not done anything to injure my shoulder/armpit. I do not have any apparent ingrown hairs or any itchy sensations. My father is in remission from Non-Hodgkins & his sister is getting treatment for breast cancer. In addition their parents died from cancer. So with that kind of family history I'm a little concerned. I read that cancer lumps do not hurt but again my symptoms aren’t clearly matching anything I’ve read.