If his skin looks like any of those pics I would do what I could to get him tested asap. OR I would take him to a dermatology vet if there is one in your area. They will know pretty quick if it is CC or not. CC will get worse before it gets better. The excess calcium is deposited under the skin and will have to work its way out before the condition clears. So what starts out not looking so bad does get worse - but that is how it is supposed to work as the condition is healed. So the MOST important thing right now is to get a confirmed diagnosis one way or the other - time is not your friend with CC; it needs to be diagnosed and treatment started asap to prevent widespread problems. If I were you, I would look for a derm vet in your area if his current GP vet won't get the testing started asap.