 [ Symptoms ] i noticed a small lump in my armpit about a month ago it has gotten larger and has become painful  it is now dime sized oval in shape below the hair line there is a shooting pain from the lump into my shoulder and breast the pain started yesterday and is getting worse i have checked for ingrown hair and its not there is no discoloration and is very tender to touch should i go see my doctor as soon as possible [ Disease ] it is hard to confirm a diagnosis for that over the internet without a medical history and clinical exam it is most likely from some minute trauma somewhere in your mouth or perhaps an indication of some periodontal gum problem gingivitis lots of other possibilities you should visit a dentist