I don't know if you are using an additional light source (infinite light?) to bring out more detail, but I had a similar problem with this image below:

You will notice the brighter area between the left arm and torso, self-illumination. I introduced an infinite light for more contrast but that seems to be a mistake. The next render is without any additional lighting, just lighting from the HRDI.

Notice the difference, normal occlusion in the second render.