I had no idea cats could get acne, but my calico has it! She developed these awful scabs and bumps under her chin. I took her to the vet and was told that she may have developed an allergy (possibly to her plastic food bowl) that caused her to have acne. She wouldn't stay still enough for the vet to clean her chin properly so she had to stay overnight so she could be sedated to receive the proper treatment. She's going to get a steroid injection too and then I'm supposed to clean her chin daily with Clearasil pads.