I found a pea-sized lump in my armpit that stings when pressed or moved, and all today I e felt sickish; tired, stuffed nose , phlegm , etc. I tend to feel like that most days though due to allergies, so I m not sure what to think there. I m eighteen now, turning nineteen end of this month. May be unrelated, but I also found a pained lump under my chin a few years ago that has come and gone repeatedly since then, if that helps.