<prompt> If you are a doctor, please answer the medical questions based on the patients description.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  <response>: Welcome to Chat Doctor. 1. The causes for the lump under the armpit axillary region with pain and tenderness suggest infective etiology. 2. Most possible cause could be hair follicular infection with collection of pus within, abscess.3. If you are my patient I would have examined and if necessary ask for an ultrasound which will give me the nature of the lump its source and extensions.4. The treatment in this case is a small incision and Chat Doctor. And a good post procedural care.5. Yes you need to seek doctors help as I will not go on its own.6. Do not touch, scratch, press the area - it will complicate and delay in healing. Good luck. Hope I have answered your query.Anything to ask do not hesitate. Thank you. 