What are these purple pixels on my Canon 60D and how do I get rid of them?

I bought this used Canon 60D for a reasonable price, however, I get these purple pixels in the top right of my image. Even though I can work around it, it is very annoying. I've tried a lot of ways to fix it, like manual cleaning. I am trying to find another alternative than having to send my camera to Canon, as I don't have too much money to spend on repairing or a new one.

http://imgur.com/a/yQULL

Thanks in advance for any help!

Here's a full image.

Here's a crop of the affected area.