Hello, I woke up this morning and noticed nickel sized lump on the under side of my tricep. It feels round and I can see it sort of poking out. Pain is there and is about a 6. A very light feeling does go down my arm. This is something I never felt before this morning.
Hello! Thank you for the query. From your description this lump is most likely some kind of abscess. Abscess can appear due to infection of the soft tissues. You could have a sebaceous cyst in this area before it has started. Injury can also cause such issue. It is advisable for you to have it Chat Doctor.  When the pus is evacuated, the pain should be gone and so is the radiation. Please consult general surgeon with it. Hope this will help. Regards.