Do male (or female) chimpanzees get acne at or around the time of sexual maturity?
If so, do other primates? Do other non-primate mammals? How far back does this trend of puberty-pimples go?
If not, what's made us so special? Is acne a trade-off for some other advantage (e.g. are we oilier, or more soaked in testosterone at puberty than other primates, for some good reason that has acne as an unpleasant side-effect)?