Please choose the correct ending to complete the given sentence: Food and Entertaining: [header] How to treat feline acne [title] Look for small, black spots. [step] Typically, these acne lesions are found on a cat's chin. The spots (blackheads or pimples) are small, firm and black.

Ending1: [substeps] There are also five small, brown spots. These pimple-like areas are usually painful and can become sores from acne. Ending2: If you stroke him just under the chin, you'll notice that the skin feels gritty. [substeps] While acne is usually found on the chin, your cat may also have acne lesions above his lip. Ending3: They are also located on the skin behind the ear (in the upper jaw). The red spots, however, are small, dark and superficial. Ending4: The additional lumps do not appear immediately, but they increase in size with age. Look for any dark spots on the chin, a white raised scar that lines the hairline, and a few small craters that look like bumps or scars.

Answer format: ending1/ending2/ending3/ending4