Dear Threadstarter,
To illustrate sulhan's point :
You can try inverting your original image (without cropping) 180 degree to see where those spots come from.
Just for illustration, I download your picture and created a GIF animation to let you see where is the problem area. Cheerz.
To illustrate sulhan's point :
These are re-reflected light internally to the sensor surface to the inner lens surface and back again into the sensor. The lights are practically reflected and then inverted as it re-enters the sensor.
This problem may be inherent to the grade of anti reflection coating of the lens internals. The source of light may just be too "strong" with respect to the rest of the other light source. Stopping down the lens (use higher aperture values) may help at times.
You can try inverting your original image (without cropping) 180 degree to see where those spots come from.
Just for illustration, I download your picture and created a GIF animation to let you see where is the problem area. Cheerz.