My Jersey cow has tender bumps under her skin ranging in size from tiny to a lumpy silver dollar. The largest ones look like a cluster of smaller bumps and the skin feels hard and hollow underneath like an empty blister. She really doesn't like me to touch them so they must hurt. there is no hair loss. Other than that she seems to be behaving normally and eating well. The vet is coming out in 2 days, but if anyone knows whats going on I would appreciate help. This came on quite suddenly. Any ideas??