ANSWERS: 1
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It seems so. Acene is primarily caused by genetics but this genetic coding will have come about earlier in our history. So let's go there. Our hormones produce more sebum which helps cause acne. Stress, caused by a wider range of emotional problems occuring during human adolescence. Over active sebaceous glands, again caused by over active hormones. Accumulation of dead skin cells, animals tend to shed their skin more than we do, ours gets clogged up. Certain bacteria getting in the pores, well that can happen to any animal with pores! Use of anabolic steroids. Any medication containing halogens, lithium, barbiturates or androgens. So alot of these only really occur in humans, thus acne only really occurs in humans.
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