Is it safe for my cat to eat cooked yam, and what about the skin or raw yam?

Yes, plain cooked yam is safe for cats in small amounts. The skin is not toxic but can be tough to digest, so it's best to peel it. Raw yam is not recommended because it's hard and may contain compounds that cause mouth irritation or stomach upset. Always serve it cooked, unseasoned, and in tiny pieces to avoid choking. Offer just a bite as a treat and watch your cat's reaction; call your vet if you see vomiting or diarrhoea afterward.