Is palmres cocoa butter formula with vitamin E or pure cocoa butter will helpful for1 mm depth 3mm radius small depressed scar on face?

Cocoa butter. It may need revision rather than cocoa butter.
Facial scar . Massage is helpful for most scars, to soften them. Using cocoa butter or vitamin E can help moisturize the scar. Neither will help remove a scar though. Your scar is small enough that it might make sense to have it surgically treated (in office under local anesthesia). See a board-certified plastic surgeon.