Your cat has vanished from inside the house. He either got outside when you opened the door and you weren't quick enough to catch him, or he
Jacqueline, this is very interesting. Can you send us a photo so we can have a better idea what you are referring to? Is he itchy or uncomfortable? Have you seen your vet about this? It is a tough question to answer without a more detailed picture, however, it could be a number of problems including mites, fungal disease, skin infection or just normal shedding. Please see your vet and share photos with us so we can understand the situation better!