In the second picture it does look like leather ear. I think I've heard of it being treated with anti-fungal creams?
From "shooter dog"
Alex's Yorkie Care Frequently Asked Questions. Page 3.
At the first sign of black around the edges of the ear, wipe the ear with "dog-o-dontic pads" dipped in alcohol. Bathe in Betadine or Plexadine Shampoo, paying particular attention to the ears, end of tail, and hocks. Use Ear Guard by Gerard Pellham regularly in the ears and cover the ears, hocks, and end of tail with a thin coating of Lotrimin 1%....no other kind of Lotrimin...just Lotrimin 1%, every day until the problem is solved! You will notice the ear begin to get very dry. Stop using the Lotrimin 1% if the ears get too dry! Another product which I have recently used for this problem is #l All Systems Tea Tree Oil and I'm happy to say that it works! This stuff is also really good to spray on "wrappers" as it is not too tasty!
Softer coated dogs never seem to have a problem with this but the silky coated dog with a lower skin temperature seems to have a problem when colder weather and high humidity prevail. Keep the dogs warmer and wash them at least once a week using Betadine or Iodine shampoo in those areas which are susceptible. You will be in control if you follow these instructions. It is also a good idea to have your veterinarian do a thyroid function test on dogs with these symptoms because some dogs with this problem also have a low thyroid function and medication may help the situation and keep the dog from becoming sterile and the bitch from having unusually small litters.