Supposedly we don't have any fleas here. I've never groomed any dog with fleas, and neither have the other groomers....so if there are any in Utah, they aren't close to where I live. I've never used any sort of flea/tick medication on him. I guess I should, we do have ticks (more in the mountain areas) but I've heard of health risks to those products, and I don't know if it's worth it or not.

And I have looked closely in his coat, and nothing else unusual besides that spot.

It may be possible that it's bug bites...