I am a male, I had unprotected oral and vaginal sex with a female. 4 days later I notcied a lump in my left armpit while showering. Next day it grew to about the size of half a golf ball. It is painful to the touch, the rest of the arm kinda hurts but not to the point that I am unable to do anything, colorless (it is under the skin), and has not continued to grow since two days ago. It has been a week since my sexual encounter, I have no other symptoms other than this lump in my armpit. Also I swear a lot while working, my arms break out with red bumps and pimples often. So question is, what is the lump? I’ve been searching online nonstop for the past few days and have convinced myself it’s hiv or cancer and I’m kinda freaking out out. Planning on going to a doctor in the next few days. Any suggestions as to what it is would be appreciated. Thank you!