I had an odd lump somewhere else and fretted about it until my doctor could fit me in... it too turned out to be a swollen gland (who knew?) and I took some anti-biotics for a while until it was all gone. As much as you might hate the doctor, thnk about how much nicer it'll be to have piece of mind knowing that everything is ok. You are still young, but you still shouldn't ignore odd lumps.