Absolutely- dry lips, nose bleeds but it's the only real cure for acne as it takes away internal skin oil which the acne bacteria thrives in.
Yep its the only thing that works i was on it as a child and its like a miracle cure after youv spent years trying all other creams and pills.
However the OP is talking of acne scars and roacutanne is for active acne
OP - i also have acne scars on my back and never had a problem, i do feel conscious if they offer a massage and so refuse but most time they dont see your back much
There is no easy cure, scars fade over the years to an extent, but tougher scars need laser treatment. Bio oil is a long term option but never used as i cba using it daily for months and yrs. a short sun bed session will help appearance short term