I had one of those. Turned out to be a swollen lymph node. Doctor treated me like an idiot for being concerned about it. Oh, I’m not bitter. clenches fists
Could it be one of these? WARNING!!! EXTREME ZIT/CYST GROSSNESS!!! Not for the faint of heart nor the queasy of stomach. (But it’s pretty freaking awesome.) NSFW language.
ETA: don’t try to squeeze a swollen lymph node thinking it’s a cyst. That shit hurts.