Why does my back scar so easily but not the rest of my body ?

I get a lot of pimples on my back and it sucks because I don’t mess around with them or irritated them at all and they just dry up and scar easily and they stay there . I got a razor scar on my back and it’s still showing there . I don’t have this problem anywhere else on my body , only if I irritated really bad ,... show more I get a lot of pimples on my back and it sucks because I don’t mess around with them or irritated them at all and they just dry up and scar easily and they stay there . I got a razor scar on my back and it’s still showing there . I don’t have this problem anywhere else on my body , only if I irritated really bad , why is this ?
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