You could fix this issue in a few ways. If you want to repair the camera, you can disassemble your camera and replace the lens. A new lens can be purchased here on Amazon.
Here's a video that shows what's involved in the replacement:
If you don't want to dissemble the camera, you could purchase a UV filter and snap it onto the front of the camera. While it won't replace the glass on the front of the camera, it will protect it.
If your camera is working fine just use filters instead of replacing it! Just remember NOT to blow into it as any dust will end up on your sensor & you will in fact end up having to replace it.