I agree with Raniah, it sounds like a ganglion cyst. Harmful, but can be painful. You should try to take baths as hot as you can stand, so that you can get it to head. Do this a 3-4 times a day and once it gets to a head, you can pop it and the pressure will be released. I do not think this is something you need to go to the ER for. Maybe check into a urgent appointment clinic if anything. But I would leave the ER for life threatening things, and I don't think this classifies as life threatening. Good luck!
Gail*Nanners* Co-Moderator for Anxiety/Panic Forum
Been living with Crohn's Disease for 33 years. Currently on Asacol, Prilosec, Estrace, Prinivil, Diltiazem, Percoset prn for pain, Zofran, Phenergan, Probiotics, and Calcium and Xanax as needed. Resections in 2002 and 2005. Also diagnosed with Fibromyalgia and Osteoarthritis and Anxiety. Currently my Crohns is in remission.
*Every tomorrow has two handles. We can take hold of it by the handle of anxiety, or by the handle of faith"*
*~* https://www.healingwell.com/donate *~*