<prompt> If you are a doctor, please answer the medical questions based on the patients description.I have some sort of pea sized lump on my armpit. Im not sure if it is due to an ingrown hair or if it is something I should be more concerned about. I have also been experiencing a sore neck in back only when I turn my head to the left or right. I have not been sleeping on a bed for several months--instead sleeping on a sofa. So, should I be worried?  <response>: Welcome to Chat Doctor .1. According to your description seems like, it is of concerned.2. It could be carbuncle fur uncle hair follicle generally appears with redness and tenderness with pus discharge.3. An abscess also can expect similar picture - comes with fever.4.Finally, lymph nodal enlargement due to any underlying systemic or local inflammation infection 5. Your symptoms are severe - take appointment as soon as possible and let doctor examine.6. Hope it will help and I have answered your questions. Anything to ask ? Do not hesitate. Thank you. 