Hand washed the car a few months ago and noticed it. Ignored it for a couple months since you can only see it from certain angles. But after washing it recently I can't unsee it. Was trying to save a trip to the dealer and go when my oil change is due but I'm at 40%. Sent Acura Customer service the photo and they dismissed me said go to the dealer. I'm all for testing quality control and contributing to a better product/process but the back and forth trips to the dealer is getting old.
I know I chimed in on the other thread too. Mine looks like dust on the inside as well, as well, but it's micro abrasions on the outside of the headlight, not on the inside. Have to play around with light to see that clearly. The above looks like something different although it wouldn't surprise me if that's chemical etching on the outside also.
Pointed it out to my service advisor during my B service. He acknowledged it as an issue and took photos of both (i pulled out a portable shop light to help photograph them ). Pending on Acura Corporate Approval