Skip to Content

My Cat Has Patches of Fur Missing and Sores: 5 Possible Reasons

My Cat Has Patches of Fur Missing and Sores: 5 Possible Reasons

❇︎Affiliate Statement: The services and products that I may link in this article are ones that I use myself and am proud to recommend. If you follow one of my links please be aware that I will receive a small commission from Amazon or other vendors. I’d also like to say a big Thank You for your trust if you do.

As cat lovers, we all cherish our feline friends and their beautiful, glossy coats. So, it can be quite alarming when we notice our precious cats have developed bald spots and sores on their bodies.

If this is a situation you’re facing, rest assured that you’re not alone. My own cat has recently developed these symptoms, and I couldn’t help but worry about her health. This led me to research the topic to better understand the issue.

Hair loss in cats, though common, warrants attention when accompanied by sores. Potential causes include allergies, fungal or bacterial infections, parasites (mites or fleas), and underlying medical issues (hyperthyroidism, autoimmune disorders, or hormonal imbalances etc.).

Now, we’ll explore each of these potential causes, how to recognize them, the reasons behind the development of bald patches and sores, and the appropriate treatment methods.

Hair Loss in Cats

Full or partial hair loss in cats is known as alopecia. This common condition can affect felines of all ages, breeds, and genders. Alopecia can manifest in various ways. It can range from small, localized patches of hair loss to more extensive and widespread hair thinning or baldness.

The severity of hair loss in cats can vary greatly. Hair loss may be either temporary or permanent, depending on the underlying cause. Although alopecia is not typically life-threatening, it can indicate an underlying health issue that requires attention. Furthermore, it may cause discomfort or stress for the affected cat.

There are numerous potential causes for full or partial hair loss in cats. For example, external parasites such as fleas, mites, or lice can lead to excessive grooming. This can cause itchiness and subsequent hair loss. Allergies to environmental triggers or food can also result in hair loss and skin inflammation. Hormonal imbalances, such as hyperthyroidism or Cushing’s disease, can disrupt the normal hair growth cycle. This can lead to thinning or loss of fur. Bacterial or fungal infections, such as ringworm, can cause localized hair loss and skin lesions. In some cases, hair loss in cats may be a hereditary condition. It can also result from a genetic predisposition.

What are Sores?

Sores or ulceration in cats refer to open wounds or lesions. These can be found on the skin or mucous membranes. They can be painful and potentially lead to infections. Ulcers can develop anywhere on the cat’s body. They can indicate a variety of health issues. Medical attention is essential for a cat with sores or ulcers. This helps prevent complications and ensures proper healing.

Numerous factors can contribute to the formation of sores or ulcers in cats. Causes include bacterial or viral infections, autoimmune diseases, trauma, and exposure to toxins or irritants. A thorough examination by a veterinarian is important. This helps determine the underlying cause of the sores or ulcers. Depending on the diagnosis, appropriate treatment can be provided. Treatment can help alleviate pain, prevent complications, and promote healing.

Gray and white colored cat scratching himself on coatch

What Causes Bald Spots and Sores On My Cat?

While it’s essential to consult your veterinarian to pinpoint the precise cause of your cat companion’s bald spots and sores, it’s still helpful to be aware of some possible explanations to know what signs to watch for.

The most prevalent reasons for hair loss and sores in cats include:

  • Allergies
  • Flea Infestation
  • Fungal Infections (Ringworm)
  • Stress-induced Overgrooming
  • Skin Parasites

1. Allergies

Cats can suffer from allergies, just like humans. These allergies can manifest in various ways, including causing bald spots and sores on their skin. Allergens can be found in the cat’s environment and in the food they consume.

Environmental allergens may include substances like pollen, mold, or dust mites. Food allergens can be proteins found in certain meats or grains. A study indicated that approximately 0.2% to 1% of cats experience food allergies. Beef, dairy, and fish are the most common allergens.

Allergic reactions in cats typically trigger the release of histamines. This can lead to inflammation and itching. As a result, cats may excessively groom or scratch the affected area. This can cause hair loss, sores, and sometimes secondary bacterial infections.

Veterinarians need to identify the specific allergen causing the issue. This may require a process of elimination through food trials or allergy testing.

2. Flea Infestation

These external parasites can lead to intense itching and discomfort. Fleas are small, wingless insects that feed on the blood of their hosts, with cats being one of their preferred targets. Nearly 50% of all dermatological issues in cats seen by veterinarians are related to flea infestations. Flea allergy dermatitis (FAD) is a particularly severe form of flea infestation, in which a cat develops an allergic reaction to the saliva of the fleas, exacerbating the itchiness and discomfort.

When a cat is infested with fleas, they will often groom and scratch themselves excessively in an attempt to relieve the itching caused by flea bites. This over-grooming and scratching can lead to hair loss, skin irritation, and the development of sores, especially around the neck, head, and tail. In some cases, a secondary bacterial infection may develop in these open wounds, further complicating the situation and potentially leading to more severe health issues.

3. Fungal Infections (Ringworm)

Ringworm is caused by a group of fungi called dermatophytes. This contagious skin infection can affect both animals and humans. Ringworm is more prevalent in kittens and cats with weakened immune systems. However, any cat can contract the infection.

Cats infected with ringworm typically develop circular patches of hair loss. They also have red, scaly, or crusty skin. These lesions can appear on any part of the body. They are most commonly found on the head, ears, and tail.

As the infection progresses, the affected areas may become itchy and inflamed. This causes the cat to groom or scratch excessively. It can lead to the formation of sores and further hair loss. Ringworm infections are highly contagious and can spread to other pets and humans in the household.

4. Stress-induced Overgrooming

Psychogenic alopecia is a behavioral issue that can lead to bald spots and sores in cats. This condition occurs when a cat grooms itself excessively as a response to stress or anxiety, causing hair loss and sometimes skin damage. While grooming is a natural behavior in cats, stress-induced overgrooming can result in more severe consequences.

There are various factors that can contribute to stress and anxiety in cats, including changes in their environment, the introduction of new pets or family members, illness, or pain. In response to these stressors, cats may engage in excessive grooming as a coping mechanism, which can lead to the removal of hair and the formation of bald patches. These bald spots are often symmetrical and can be found on the cat’s abdomen, inner thighs, or other easily accessible areas.

5. Skin Parasites

Skin parasites are another common cause of bald spots and sores in cats. These parasites can cause significant discomfort, leading to excessive grooming and scratching, which in turn results in hair loss and skin damage. Some of the most common skin parasites affecting cats include ear mites, mange mites, and lice. The prevalence of these parasites can vary depending on the geographical region and living conditions of the cat, but prompt identification and treatment are crucial to prevent the spread of the infestation and minimize the risk of complications.

The most common skin parasites in cats include:

  • Ear mites: These tiny parasites primarily infest the ears, causing intense itching, inflammation, and discharge. Ear mites can also affect other parts of the body and are highly contagious between cats.
  • Mange mites: These microscopic parasites burrow into the skin, leading to severe itching, hair loss, and crusty skin lesions. Notoedric mange is highly contagious, while demodectic mange is not.
  • Lice: Though less common than mites, lice can also infest cats, causing itching, hair loss, and skin irritation.

How to Treat Cat Hair Loss and Sores

Treating hair loss and sores in cats involves addressing the underlying cause, managing symptoms, and preventing complications. It is essential to work with a veterinarian to determine the cause of the hair loss and sores, as treatment options will vary depending on the specific issue.

If allergies are the cause, removing the allergen from the cat’s environment or diet is the first step. The veterinarian may also prescribe antihistamines, corticosteroids, or immunosuppressive drugs like cyclosporine to manage inflammation and itching, allowing the skin to heal and hair to regrow.

For flea infestations, the use of topical or oral flea control medications (fipronil, imidacloprid, or selamectin) is essential to kill existing fleas and prevent future infestations. Treating the cat’s environment by vacuuming, washing pet bedding, and using environmental flea control products is also necessary to eliminate the flea population.

If a fungal infection like ringworm is present, the veterinarian will prescribe topical and oral antifungal medications to clear the infection. Examples include miconazole, clotrimazole, or itraconazole. During the treatment process, pet owners should thoroughly clean and disinfect their home environment. This minimizes the risk of reinfection or transmission to other animals or people.

Regular grooming, routine veterinary check-ups, and maintaining a clean living environment can help prevent hair loss and sores in cats.


When your cat starts losing hair on their back and showing sores all over their body, it’s natural for you to become extremely concerned. Witnessing this can be quite distressing, and you know you need to take action to ensure your cherished pet’s well-being.

Fortunately, you’ll find that these symptoms can arise from a variety of conditions, with most being relatively benign.

As soon as you observe your cat’s fur loss and sores, it’s important to promptly bring them to the veterinarian, and you should definitely follow this course of action. Consulting with a professional is essential for accurately determining the cause and devising an effective treatment strategy. By adhering to the vet’s guidance, you can successfully help your cat recover and regain their healthy appearance quickly!