My five year old blue nose pit is breaking out with small(size of a dime) to large (silver dollar)size soft bulbus bumps on her body they appear to go up and down in size dependent on her exposure to the sun. They never seem to completely go away when at the smallest size they appear to and remain a discoloration. Any ideas? Thanks Biil

Optional Information:
Age: 5; Female; Breed: bluenose pit

Already Tried:
my vet just shrugs her shoulders has no idea what it is.