Arf-Arf Lichen!
I too got a bad skin problem. I think I got it after my BARK THE VOTE 8300 mile tour in October to get humans to vote and visit shelters to help pets in need (
Schmitty - Online Shop for Dog Toys, Gifts, Pet Calendar, Greeting Cards & Designer Dog Collars and check out BARK THE VOTE blog and fun vidoes!). I stayed at lots of hotels that use bad chemcials to clean the carpets and stuff. Anyway, just like your pooch, I got scab like blisters all over, a rash and loss of some fur. I got a blood test and my throid was low - which is hyperthyroid - who knew! I was also was more sluggish. So, I'm taking pills for it. It's gonna take a ong time to get my skin better, but I'm on my way.
BTW - food is also the #1 problem with skin conditions. so, even though you think you are giving good food - you might want to really read the contents and make sure. I eat boiled organic chicken, veggies like green beans, sweet potatoes, peas and blueberries. So, doulbe chekc the food. Big dog food companies might tell you one thing, but you have to be your pooch's best advocate. Whatever that means!
OK, gotta go nap. Hope this helps. Arf-Arf, Schmitty