Had actinic keratosis frozen off with liquid nitrogen and still have an indent in my nose. Treatment options? (photos)

This requires an in-person formal evaluation. I recommend you seek a board-certified dermatologist to discuss next steps. Microneedling may be an option. -Dr. Emer

As with any indented scar, from any cause, subcision +/- a filler can work well for elevating & smoothing the scar. I have personally been performing subcisions for this purpose since 1994. You would be wise to consult a board certified cosmetic dermatologist with expertise in scar treatments, particularly subcision. Hope this helps and best of luck.