Black Line on Camera Screen Problem! Help Please

See that little black squiggle line on the bottom right. It just today appeared on my iPhone 5 camera while I was in the middle of taking pictures. Every picture. When I zoom in, the line zooms larger.

At first I assumed, easy, must just be a piece of lint on the lens or something. But I've tried thoroughly cleaning the lens, tried wiping it with a tissue, tried a q-tip, blasted the lens over and over again from every angle with a compressed air cannister, but no luck.

I don't see anything on the lens, I really don't know what is causing this line to appear. Can anyone help?