After a cat is infected by a fungus, there will be a certain amount of melanin deposits, which are the black spots you see. This is a normal phenomenon. The owner does not need to worry too much. You can use antifungal drugs and drops on the cat every day. Generally, it will improve in 10-15 days and new hair will grow, or you can take it directly to the pet hospital for examination and medication under the guidance of a veterinarian. You should pay attention to the hygiene of the cat's living environment and regularly deworm the cat to enhance immunity.