Given the cold winter, could he have gotten his ears frostbitten? (Although that doesn't look too typical of what I've seen in frostbitten ears...)
Frankly, I think I'd be heading for the vet sometime in the near future just to set my mind at ease. Hair loss and flaky skin can be a sign of hypothyroidism or other metabolic disorder, among other things, and it's always best to catch that stuff early.
Welcome to the board, btw. And if you have time and more pics to share, we'd love to see the rest of your dog!