Sphynx cats need baths to remove allergens, such as pet dander.
Sphynx cats need to be bathed regularly to remove the oils that can build up on their skin and cause them to become allergic or develop other skin problems.
Sphynx cats have incredibly oily and sweaty skin (as they don't have that protection layer from fur as hairy pets would) if not bathed regularly. They need baths at least once a week to keep their skin healthy and free of infection.