Smudge under my iPhone 5s screen?

So I noticed it earlier and it looks like someone has scrubbed a small mark on the bottom right corner of my screen, and yes you can still see things like if you scrolled down a story or whatever words will still appear on that specific bit it's just annoying, it's so noticeable. I got it in July last year so I don't think it's under warranty anymore. I restart my phone as well and nothing happened. Anything I can do? It's definitely in/under the screen, I can promise that. Anything I can do?

How to send and save multiple contacts on an iphone (or any phone)?

How to send and save multiple contacts on an iphone (or any phone)?

Added (1). i work for a company the has a contact sheet it sends out and updates regularly for its current employees, is there any way to send this in a file that can automatically put the contacts in or does it have to be one by one?

Iphone makes all other devices disconnect from Wi-Fi?

Recently bought an iPhone 6s and connected it with my mac, now every time I connect to my Wi-Fi with my phone every other device disconnects including the mac. When you I try to connect them again it says password is incorrect. It does it with everything. Ps4, my girlfriends s6 literally everything else using the Wi-Fi gets kicked off and can't connect. Then as soon as you disconnect the iPhone from the Wi-Fi everything connects and works fine.
Can anybody help?
Has anybody had this problem?

Why has cheating in a relationship become a popular trend?

I understand people have been cheating on others since the dawn of time. But it seems in todays age it has become a sport or trend. I see gifs and memes all the time on the internet of people trying to unlocks their lovers iphone so they can see who they are cheating with. And when i googled it, all these sites came up talking about how cheating is good for a relationship. I do not understand this. Someone explain to me why cheating has become awesome.

How much money is Adobe flash cc?

I live in the UK, so the currency is pounds and quids (I guess) And I want to buy Adobe flash CC, but I don't know how much it is or what the serial number is. If you can tell me, that would be great. I'lld give out points for the best answer.

PS. How much is paint tool sai and where can I buy it?

Added (1). Oh, is it free? Or is it just the trial (Adobe flash) And also, how do I get the code?