I have had a lump under my arm for the last couple of months or so. It isn't hard, but I don't really know how else to explain it. It comes and goes in terms of how swollen it is and how much it hurts, and it feels like it is almost in sync with a dental abscess I have on the right side of my gums. Could the lump / pain in what feels like my underarm lymph node be caused by the abscess? I have been stressing about it for a long time now and know I need to go to the doctor and dentist both (I am working up to scheduling a dentist appointment with sedation dentistry and scheduling a dr's appointment for a yearly checkup... long overdue since it's been over 2 years now) but would just like some reassurance or input on this... if anyone has any idea at all. Thank you.