I’m afraid I have never heard of a cat getting hemorrhoids before. Cats do have anal glands positioned at about 11 o’clock and 2 o’clock on their anus. Sometimes the anal glands need to be expressed by a veterinarian. Have you seen Corky “scooting” his bottom on the ground/carpet? Have you seen him excessively lick that area or bite it or chase his tail? Any foul odor? If there’s swelling in that area it could mean his anal glands are impacted because normally they are small and cannot be seen with the naked eye. I would keep an eye on it. If it doesn’t go away, I would probably have it looked at by a vet because the sacs can rupture and that’s not good (and would require a lot more veterinary intervention, antibiotics, etc.)