Is a small, long-standing mark on my cat's heel normal or ringworm?

This may be normal. After ringworm has healed, the animal may have a dark mark left where the rash was. This is called post-inflammatory hyperpigmentation, but I can't be sure without seeing Apollo in person. In the picture, it almost looks like scabs. I would have it checked out by his vet to be safe. I hope this helps.

From what I can see, it looks like a small scar. If it's not swollen, has discharge, or feels warmer than the rest of him, I would keep an eye on it. The next time your cat is in for his annual visit, show it to your vet, but it doesn't look like anything to be concerned with from these photos.

I would get that checked by your vet. I don't know how old your cat is, but older cats will develop moles or warts that are benign usually. If it has been there without any rapid changes, I would be less concerned if he is an older cat, but it is still worth getting checked. If it suddenly changes size, color, or texture of starts to bleed, get him seen right away.

The picture is not very clear, but I see some crustiness and possibly some hair loss. I worry about ringworm (a skin fungus) with that type of lesion, because this is also a very common location for ringworm in kittens. It could also be some other infection or due to a scratch or bite. It is not normal though and to determine the cause, you would have to bring her into the vet for an exam. They can take a sample (if needed) and look at it under the microscope to find out what it is. For now, it's best to consider it contagious, because ringworm can be transmitted from cats to people. This is usually self-limiting (will go away on its own), but may need treatment if you start to see more lesions. You can wash it once a day with medicated shampoo labeled for cats (can be found at the pet store). This will help if it is an infection.

You are right to question this. While I can't make a ringworm diagnosis based on visual exam, I can say that Momo has a text-book-looking ringworm lesion. You might consider having your own vet do a pre-purchase exam. You can ask the breeder to send the records. If it turns out that the breeder in not be honest, then that would be a big clue to walk away from this deal. Breeders definitely don't have the best reputations, so I think an independent evaluation is always a good idea. You should also make sure she has received her vaccines and deworming. I hope this helps.

This does not look like a natural shedding and it does look suspicious for ringworm but a cut or abrasion can sometimes be this same circular shape. As you probably know, ringworm is contagious to humans as well. Ringworm can generally be diagnosed by your veterinarian and I recommend to get your kitty checked out so that you know what you were dealing with. Best of luck and please feel free to post any additional questions.

We can sometimes see color changes in haircoat in animals as they age, or as a result of inflammation or trauma to the skin. If there are no lesions (redness, crusts or scabs, raised bumps, etc.) and your kitty is not bothering at the area by licking/scratching at it, I would just continue to observe the site. I would check it weekly for changes. If he begins to lose hair, starts licking/scratching, the skin looks red or irritated or other spots appear, then a vet exam is recommended.