In addition to the other points that have been made, it’s worth noting that we live in different climates (some artificial) and eat a different diet (much of it artificial) than did our ancestors. (I don’t know what the acne rate is among modern-day tribal societies.) Tens of thousands of years aren’t enough to completely rewire hormonal effects on sebaceous glands in response to a rather minor selective effect.
In addition to the other points that have been made, it’s worth noting that we live in different climates (some artificial) and eat a different diet (much of it artificial) than did our ancestors. (I don’t know what the acne rate is among modern-day tribal societies.) Tens of thousands of years aren’t enough to completely rewire hormonal effects on sebaceous glands in response to a rather minor selective effect.