I would like to ask what kind of UVB spectrum You use? 5.0 or 10. 0 ? In reptile's lamp we have light spectrum for tropical animal (that is UV B 5.0 or 100 ) and for desert one ( UV B 10.0 or 150) http://www.exo-terra.com/en/products/compact_fluorescent_bulbs.php
Which one You used?
We had a pig in rescue that had this diagnosis and was successfully treated with the protocol stated here. It was a young pig with the satin coat.