Solution
If certain kinds of black stains, dots, or dust are always visible in the same areas on images captured with the camera, dirt or dust may have adhered to the image sensor (CMOS).
Clean the image sensor, prevent dust from appearing in images
When changing the lens on a Digital Single-Lens Reflex Camera or Interchangeable-Lens Compact System Camera, depending on the environment and situation, it is possible for particles and dust in the air to attached to the image sensor.
IMPORTANT
If the dirt or dust cannot be removed by the means above, please consult a Canon repair center.
Removing dust from images using the software that came with your camera
The Digital Photo Professional software that came with your camera* has a function that you can use to remove unnecessary spots (dust and dirt) in images and blend those areas in with their surroundings. For details, please see the Digital Photo Professional instruction manual.*
*If the abovementioned items (Digital Photo Professional software/Instruction Manual) were not included with you camera, please download them from the Canon homepage.