We also have a 2018 Blizzard Pearl Highlander and these spots are small and rust colored and are popping up everywhere on this vehicle. I first noticed it on the rear tailgate and now they are on the drivers door and rear bumper which is not metal. I tried a cleaner wax but these spots are definitely in the paint and I’m bringing this car into Elmhurst Toyota where we bought it. This is an XLE model and it only has 17,000 miles on it and I’m totally disgusted with how this could happen . The vehicle is garage kept and I always take care of my vehicles. My first Toyota after owning 4 Ford Trucks, and I hope they fix this issue because I really don’t want this car right now !