Is hypopigmentation inevitable with spot dermabrasion?

I have a mildly atrophic scar on my cheek (from a skin lesion removal by curettage). It really bothers me and I am considering a spot dermabrasion. To give you a sense of the depth of the scar, I'm told it is too shallow for fillers. I am between type I and III on the Fitzpatrick scale. My PS has indicated that he won't have to go too deep but I am still worried about hypopigmentation. Is hypopigmentation inevitable with dermabrasion? If not, can anyone quantify the risk (i.e. 10% of cases, etc)?