Gota gyp that had a problem somethin like that asked my uncle what he would do. He told me Burnt oil. So i got some from work poured it on her rubed it in real good. She stayed black for awhile but other than that all her hair came back an shes all cleared up. Got rid of the fleas she had too.
X2 thats what i use if i have any hair loss issues burnt motor oil, has to be burnt "used" tho.