A pimple on a cat’s back may be caused by skin diseases, tumors, tissue hyperplasia, knotted hair, mosquito bites, etc. It is best to take the cat to the pet hospital for examination. If it is a tumor or hyperplasia, it needs to be treated in time to avoid Delay the condition; if it is mosquito bites or skin diseases, you need to pay attention to combing the cat's hair regularly and deworming on time to avoid mosquito bites and skin diseases.