for the last c 3 or 4 years what I am seeing a lot of is this fungus that starts in dime size perfect circle's and spreads and multiply to different parts of the body . The spots will vary in appearance from dry scales to a greasy spot about the size of a quarter and when peeled back you will take hair and all this fungus is very contagious I have treated it with every thing from fly spray to seven dust and iodine 1.5 % diluted with water at a 10 to one ratio works best
My personal opinion is it takes time for these to go away

I too have seen this when the shedding season really takes off. I agree most of it just takes time.