One day after using my Canon EF 28-70mm f/2.8 L USM Lens, I noticed that every photo has a huge amount of glow in the dark areas near any light area.
I tested my other four lenses to figure out if it's the lens's or camera body's fault. The other four lenses work fine without the glow problem.
I examined the problematic lens, and there seems no visible dust (observing front and back side of the lens).
Here's an example: