Painful Acne Only On Chin
I'm 22 years old, and the only one of three children who never suffered a stage of extremely severe acne during my teens (my siblings' doctor determined their outbreaks probably had to do in part with a recent discovery of overactive thyroid in both of them). Usually I get a pimple here and there, nothing too bad, and I manage fine with OtC treatments.
However, once every few weeks, maybe even months (it's hard to remember), I will get one (maybe 2 on extremely rare occasions) huge, pressured, painful bump on my chin. It's not like a regular pimple; it feels like it's embe