White mark under my sport composite back

[arthur3558]

I just saw a little white mark on the 3pm position while cleaning the back...it is noticeable when under white light but don't see it in normal day light...anyone had idea what it is?

 

[maflynn]

Could it just oil that needs to be cleaned off? Seems like something I see on my eye glasses.

 

[Xx.Gerro.xX]

I've got the same thing on mine (SGS), not in the same position but on the edge, I thought I may have marked it myself but I am pretty careful with my watch and haven't had it all that long

 

[arthur3558]

It couldn't be wipe off coz it is located inside!But it is strange indeed coz it sometimes are invisible but sometimes can be seen easily...maybe lighting problem!