iPhone 5 Camera Trouble?

Hello!

Well, so today i have noticed that iPhone's back camera is working like a charm but today I have tried take a picture and I see a few marks like dust or scratches. It's happening on videos also.

I've tried cleaning the iPhone and remains the same. Any advice? Is it possible to repair? And cheap?

Thanks in Advance.

Note: Attached is a photo as described above

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