thanks for your replies folks
I have been using sudocrem on the sore bits but hadn't realised it could be used as a sunblock - will spread it further over the remaining white bits
the photosensitivity has also caused her to have firmly swollen pasterns (two white hind socks) but I can't give her steroids as she may be pregnant vet said ok to give metacam but presume this isn't to be a regular event anyone know of safe homeopathic remedy that could be given to a sheep that may be in first few weeks of pregnancy (she may not be given the moving in and out/handling etc!) thanks