Well the thing is, I haven't touched it and it has recurred in the same area 3 times over the course of 2 months. When it isn't inflamed, it still does not heal like a normal pimple would. It just looks like its inflamed when there isn't inflammation and it remains in a viscous cycle. I'm aware that acne leaves knots under the skin, but this certainly does not seem to be the same case (comparatively with my other acne lesions).
After acne pimples go away, they often leave small knots of tissue under the skin. The body reabsorbs them over the course of months. They go away faster if you leave them alone, which is what you should do. I don't know where you got the impression "that non-inflamed acne remains colorless (well white or black comedones) until it becomes inflamed." That is not necessarily the case. This does not sound like rosacea. If your dermatologist isn't concerned that it's something else, then I am not either.
Take care.
Dr. Rockoff
Thought I should add, I have a history of extremely mild rosacea in my family, and my cheeks do tend to blush periodically in the area of the bumps but it's never anything prominent. Maybe it could be related to rosacea though, if that sounds possible to you.