1. Allergies:
* Food allergies: Cats can be allergic to certain ingredients in their food, like chicken, beef, or dairy.
* Environmental allergies: Pollen, dust mites, mold, and even certain types of grass can trigger allergic reactions in cats.
* Flea allergies: Fleas are a common culprit, even if you can't see them. A single flea bite can cause intense itching and lead to hair loss around the ears (and other areas).
2. Skin infections:
* Ringworm: A fungal infection that can cause hair loss in circular patterns.
* Bacterial infections: These can be caused by scratches, bites, or other injuries.
* Yeast infections: While less common, yeast can sometimes cause skin issues.
3. Other factors:
* Stress: While not the primary cause, stress can weaken the immune system and make cats more susceptible to skin problems.
* Hormonal imbalances: These are less frequent, but certain conditions can lead to hair loss.
* Medications: Some medications can cause hair loss as a side effect.
What to do:
If your cat is going bald by their ears, it's crucial to consult a veterinarian. They can:
* Examine your cat: Determine the cause of the hair loss through a physical examination and potentially skin scrapings.
* Run tests: Blood tests can help identify allergies, while cultures can detect infections.
* Prescribe treatment: This might involve medication (antibiotics, antifungals, antihistamines), special diets, and/or flea control.
It's important to note: Never try to treat your cat's baldness yourself. Improper treatment can worsen the situation.