The small bumps in the cat's ears may be mosquito bites, inflammation or sarcoma. It is best to take the cat to the pet hospital for examination and timely treatment to avoid delaying the condition. You should pay attention to regular deworming of cats, maintain environmental hygiene, and prevent cats from being infected with parasites or bacteria and fungi. You should also have a light diet, do not give cats random food, and let cats drink more water.