Small black shadow in the top right corner of the iPhone Screen
So, i Have the iPhone 6s Plus and one day i looked at the battery level to see how much and i Noticed a Small Black shadow in the Top right corner , and what i understood that its not the that ink black spot but its a small semi transparent shadow that appeared suddnly.
Note: I have Never Ever Dropped the Phone or it fell off.
Can someone tell me what is that and what is the solution because Its makes me uncomfortable, i think it might Increase and Spread all over the Screen
i hope that the solution Not to Replace the Screen because it is VERY Expensive
Thanks.
its more Clear on real and its more black in other colors
if more Pics Needed please tell me
iPhone 6s Plus