hello manjesha

Identification mark is something that distinguishes you from others. You might need to fill your identification mark while applying for any government of any official forms or exam purposes.

Identification mark can be anything on your face or body which can be birthmarks, medical or artificial marks such as stitch marks or moles on any part of face. Most of the times, it is not necessary to fill it though but if it is, then you can fill any of your mark which applies for you.

thanks