I have forgotten to update this. I'm typing it out, trying to be short about what happened. The plastic surgeon refused to take this lump out of my arm. He said he could damage nerves if he did it. I pushed for a biopsy. That call I got said it wouldn't be a biopsy. I've been leaving the lump there, because the last place I was supposed to go to said ''it wont be a biopsy, just talk about what next steps to take''
I'm at the end of getting help for it and it is pressing on nerves, I can tell, my arm from the lump down hurts into my hand, aching deeply and I've gone through bottles of advil to manage it, and the lump is sensitive around it too. It is possible to leave the lump, but if it's causing me pain, idk what doctors think I should do about it. I'm going to my own doctor soon to ask how I'm going to deal with this nerve pain.
Thanks to anyone who has supported me in this thread.