The large pink spots in the image look like they should be there from the out of shot light source as it isn't on the white/beige wall parts and interacts with the edges on the black/glassy panels.
But there are other problems from the 100% view area. There is a white spot with some surrounding distortion just above the middle arched window at the bottom. That bright spot could be the sign of a dead pixel on the sensor.
You don't have to pixel-peep to see the distortion which comes about because in the 550D the raw format is not truly raw but a mildly applied lossy compression. This effect is not unique to that camera and my Nikon is the same. And because the JPEG (if it's different) is likely to be based on the actual raw data so may be able to compensate better.