A cat's yellow nose that cannot be wiped off may be caused by genetic inheritance or malnutrition. The owner does not need to worry too much. He only needs to adjust the cat's diet and feed him some egg yolks, fish, beef, goat milk powder and other foods to help the cat's body replenish nutrients. In addition, the cat’s living environment must be well managed, kept dry and clean, and the cat should be regularly vaccinated and dewormed.