Welcome to JustAnswer! I would be happy to assist you. I am a 2003 graduate from UC Davis and a Medical Director of a 4 veterinarian practice.

Hello,

Well, cats can get ear infections no different than dogs. In addition, if you are using one of the cheap flea products, especially Hartz or Sargeant's, I see many hypersensitivity reactions to the products.

What you are describing sounds consistent with otitis externa (an ear infection).

This is usually caused by a bacterial and/or yeast infection. Ear mites tend to be more common in puppies/kittens or pets that remain outdoors.

Otitis Externa in Cats

Over-the-counter treatments for ear infections. None of the below therapies, alone, are recommended in the treatment of an active bacterial or yeast infection. These are my best suggestions:

Ear cleaner recommendations:

TrizEDTA: A ear flush specifically designed to work with antibacterial ear medications to help kill bacteria:

TrizEDTA Cleaner

Douxo Micellar Cleaner

Zymox

Ideally, the following would be done at your veterinarian:

Epi-Otic “Advanced” Cleaner

1. Examination of the ear canal

3. If the ear canal is dirty and not excessively painful, a deep ear flushing

6. If there is substantial bacteria identified on the cytology, an oral antibiotic should be prescribed

5. If there is substantial inflammation/swelling, a steroid injection or oral medication is prescribed

2. Ear Cytology

4. A prescription for a ear medication and ear flush is sent home

Now, I provided the above info, just in case your vet thinks it is an ear infection, so you would know what to expect.

Even though i mentioned some products above, do not go out and buy any.

I am very suspicious this is actually some type of allergic reaction, so the treatment by the vet may be different.

It may include a short acting steroid shot, as well as, starting some antihistamines to get it resolved.

Also, make sure to bring this flea product to the vet so they can see what it is...

Certainly, don't use it again, at this point.

Hope that info helps

Well, I am concerned about the warmth of ear and that the spots are back.

This ear may be a bit uncomfortable, so not so confident waiting another 2 days is advised. It's the best interpretation I can give from here.

If you still decide to wait until Monday, I would not put anything in the ear.

You could give a 1/4 tablet of benadryl 25mg antihistamine. Might help a little if an allergic reaction.

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You bet