Since around 3 4 days old, pups have hard like elongated legions under their skin on their back towards the midway and rear points. Vet gave me anitbiotics and thinks it may be a staph infection. Has nayone ever experienced this with pups this young or any age? They all are very healthy acting and have doubled in size. They will be 6 days old tomorrow. The spots seem hard like dried bubblegum. No hair loss. ???