I see a tiny line on the side of receiver of my s7 edge

[AC Question]

How can I know whether it's a crack or a scratch.since I tested with pouring water over it but nothing happened!but still I'm in doubt wether it's a crack or scratch
How can I confirm it?
Pls help

 

[belodion]

Please post a close-up photo of it.

http://forums.androidcentral.com/showthread.php?t=409154