question: I have had the flu for a few days with a runny nose, sore throat and headache.  As well as this, a lump has developed on my armpit... and has got bigger since Monday when I first noticed it.  The lump is quite painful- even when I stretch my arm I can feel it, and when someone touches it the pain is pretty unbearable. Its under the skin and resembles a boil.  Should I go to the doctor to get it seen to? Thank for your help