dent on camera screen glass

hi, i want to ask 1 things that a bit annoying me a bit regarding my G2 D802.

i just notice that under the spot light i can see clearly there is a dent (not a crack) at the camera. i try to feel but found no crack all smooth and then i notice it probably the screen layer (that protecting the camera inside) that probably defect.

it doesn't damage the quality of the camera but under the light it seems like a glimmering silver dent. can somehow back cover replacement will solve the problem?