Camera situation

I just noticed this last night in some pictures that I took with my iPhone 5. There are 4 dots or IMO what looks like pen marks which obviously it can't be seeing they would wipe right off. I took a picture of my white work desk so you can see what I am talking about

Attachment 424523

Any ideas?

Attached Thumbnails

Image may be NSFW.
Clik here to view.