This is a test of commonsense. Complete the next sentence:

How to treat feline acne
Look for small, black spots.
Typically, these acne lesions are found on a cat's chin. The spots (blackheads or pimples) are small, firm and black.
If you stroke him just under the chin, you'll notice that the skin feels gritty. While acne is usually found on the chin, your cat may also have acne lesions above his lip.