It's not a sun spot but a snow cap,Baby?: A fine example of a snowcap appaloosa horse, showing a crisp white cap that stands for homozygosity. Note how the edges of the snowcap are 'frosted', giving the horse a brushpainted look.
It looks like this horse just took a drink from the river. His nose looks like he is trying to hold the water in and not sneeze. Horse swimming up to his belly, pretty Bay horse with white blaze and pink fuzzy nose.