My mother did the vi peel and a large rash developed on her neck. she went to the er and they gave her prednisone. can this rash form a scar?

Not Likely: It is not likely. Vi peel is a chemical peel that often causes an inflammatory reaction as the superficial "burn" removes superficial skin damage. Should be all good in 3 weeks . Might need some pre-peel Prednisone before next procedure. The peel is meant for all fitz types. Have her see the peel prescribing doctor soon to evaluate.

Very unlikely. The Vi is a medium depth peel and causes inflammation , most times its mild but in some it can be more profound and responds nicely to steroids. My opinion is in a few weeks everything will be back to normal