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?
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.