Basically I think they burn your skin off revealing a new layer of skin below... although don't stop, just carry on going back and doing it again cos it's always funny to laugh at vain people!
Sounds about right. although it does seem that they try and justify there decision to use this technique by making out that they are being careful. It makes no difference really from just throwing a load of industrial acid across your own face and hoping for the best.
Normally, chucking acid at one's face or injecting oneself with deadly poison would be a sign of mental instability. Not in the name of beauty apparently.