I have personally been performing subcisions for elevating and smoothing all kinds of indented scars on a regular basis since 1995 in practically all locations of the face, as well as other areas of the body, and in all skin types. In experienced hands, subcision has a several decades' long track record for both safety and efficacy. Recently, some more aggressive instruments have been popularized that, by virtue of their more destructive nature, have caused exaggerated swelling, fibrosis, etc. However, when conventional and time-tested subcision is performed, I have not encountered a single case of any nerve damage in literally the tens of thousands of cases I have performed. You would be wise to consult with an experienced, board certified cosmetic dermatologist. Best of luck.