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Hard, hairless, flat growths on the skin (plaques) in cats

Author: Dr. med. vet. Gisa Löwe | Last modified: 20.02.2026

When to visit the vet?

Non-urgent see a veterinarian within 2–3 days

ORANGE for ulceration, Bleeding, rapid increase in size, severe pain, or if several new Lesions develop quickly.

Unsure about what’s wrong with your pet? Feel free to use our Symptom Checker for more clarity

Definition

Hard, hairless, flat growths on the skin, also known as plaquesPlaques are deposits or accumulations of substances on the inner or outer surfaces of body tissues. In veterinary medicine, they can occur on the skin, in blood vessels, or in the brain., are superficial, thickened areas of skin in cats, often characterized by a lack of hair and a hardened texture.

Can Occur with the Following Diseases:

Cutaneous Mast Cell Tumors (Mast Cell Tumors of the Skin)

Basics and possible causes

PlaquesPlaques are deposits or accumulations of substances on the inner or outer surfaces of body tissues. In veterinary medicine, they can occur on the skin, in blood vessels, or in the brain. in cats can be caused by a variety of factors. One of the most common causes is an allergic reaction triggered by environmental factors, food, or parasites such as fleas. The allergic reaction leads to an overproduction of skin cells, resulting in thickening and hardening of the skin.

Another common reason for the development of plaquesPlaques are deposits or accumulations of substances on the inner or outer surfaces of body tissues. In veterinary medicine, they can occur on the skin, in blood vessels, or in the brain. is a fungal infectionAn infection is the colonization and multiplication of pathogens such as bacteria, viruses, fungi, or parasites in an organism, which often, but not always, leads to a disease., such as dermatophytosis, also known as ringworm. This infectionAn infection is the colonization and multiplication of pathogens such as bacteria, viruses, fungi, or parasites in an organism, which often, but not always, leads to a disease. leads to inflamed, hairless patches on the skin that can develop into plaquesPlaques are deposits or accumulations of substances on the inner or outer surfaces of body tissues. In veterinary medicine, they can occur on the skin, in blood vessels, or in the brain.. Dermatophytosis is highly contagiousContagious means infectious. Diseases that can easily be transmitted from one animal to another or from animals to humans are referred to as contagious. and can easily be transmitted between animals and even to humans.

Autoimmune diseasesAutoimmune diseases are conditions in which the immune system mistakenly attacks the body's own cells or tissues as if they were foreign substances. Examples in dogs and cats include autoimmune hemolytic anemia and systemic lupus erythematosus. can also cause plaquesPlaques are deposits or accumulations of substances on the inner or outer surfaces of body tissues. In veterinary medicine, they can occur on the skin, in blood vessels, or in the brain. on the skin of cats. In such diseases, the immune systemThe immune system is the body's defense system against infectious agents such as bacteria, viruses, fungi, and parasites. It comprises a complex network of organs, cells, and molecules that work together to protect the body. mistakenly attacks its own skin cells, leading to inflammatory conditions and thickening. Examples include pemphigus foliaceus and lupus erythematosus.

In addition, hormonal disorders such as an imbalanceImbalance refers to an imbalance or disruption of normal function or composition in the body, which can lead to health problems. of thyroid hormones or diabetes mellitus can lead to skin changes. These diseases affect skin health and can cause the appearance of plaquesPlaques are deposits or accumulations of substances on the inner or outer surfaces of body tissues. In veterinary medicine, they can occur on the skin, in blood vessels, or in the brain..

Finally, tumors or benignBenign refers to a non-invasive, non-serious condition that is not life-threatening. In medicine, the term is often used to describe benign tumors that do not metastasize, meaning they do not form secondary tumors. skin growths can also be the cause of plaque formation. These can either arise primarily in the skin or occur as a secondary symptom of a systemic disease.

Typical accompanying symptoms

Itching: Cats with plaquesPlaques are deposits or accumulations of substances on the inner or outer surfaces of body tissues. In veterinary medicine, they can occur on the skin, in blood vessels, or in the brain. may often experience itching, which leads to increased scratching and licking. Scratching can further damage the skin and increase the risk of secondary infections.
Skin redness: The affected skin areas may appear reddened, indicating an inflammatory condition. The redness can vary depending on the cause and severity of the plaquesPlaques are deposits or accumulations of substances on the inner or outer surfaces of body tissues. In veterinary medicine, they can occur on the skin, in blood vessels, or in the brain..
Skin dryness: The skin may be dry and flaky, leading to an uneven skin texture. Dryness can also increase the risk of cracks and further skin injuries.
Swelling: In some cases, swelling may occur around the plaques, indicating a deeper skin inflammation.
Changes in behavior: Due to discomfort or pain, affected cats may show changes in behavior, such as increased irritability or withdrawal.

When to see a vet?

A visit to the vet is absolutely necessary if the plaquesPlaques are deposits or accumulations of substances on the inner or outer surfaces of body tissues. In veterinary medicine, they can occur on the skin, in blood vessels, or in the brain. enlarge rapidly or the cat shows signs of pain or significant discomfort. Also, if accompanying symptoms such as fever, loss of appetite, or lethargy occur, a veterinarian should be consulted immediately.

If the plaquesPlaques are deposits or accumulations of substances on the inner or outer surfaces of body tissues. In veterinary medicine, they can occur on the skin, in blood vessels, or in the brain. bleed, weep, or show signs of an infectionAn infection is the colonization and multiplication of pathogens such as bacteria, viruses, fungi, or parasites in an organism, which often, but not always, leads to a disease., such as pus or an unpleasant odor, a veterinary visit is urgently needed. Such symptoms may indicate an advanced infectionAn infection is the colonization and multiplication of pathogens such as bacteria, viruses, fungi, or parasites in an organism, which often, but not always, leads to a disease. that requires medical treatment.

Likewise, a veterinarian should be consulted if the plaquesPlaques are deposits or accumulations of substances on the inner or outer surfaces of body tissues. In veterinary medicine, they can occur on the skin, in blood vessels, or in the brain. persist or worsen despite home care and treatments. This may indicate an underlying condition that requires special veterinary intervention.

Symptom recognition for the pet owner and veterinary diagnostic procedure

It is important for pet owners to examine their cat’s skin regularly to detect changes early. Look for unusual thickening, redness, or hairless spots. If you notice such changes, note their size, color, and whether the cat shows signs of pain or itching.

During the veterinary visit, the veterinarian will perform a thorough clinical examination of the cat. This usually includes a detailed medical historyThe medical history is the systematic collection of a patient's medical history through questioning. It includes information about previous illnesses, treatments, allergies, and lifestyle habits. to identify possible triggers and accompanying circumstances. The veterinarian may order skin swabs, biopsies, or blood tests to determine the exact cause of the plaquesPlaques are deposits or accumulations of substances on the inner or outer surfaces of body tissues. In veterinary medicine, they can occur on the skin, in blood vessels, or in the brain..

In some cases, a skin test for fungal infections or allergies may be performed. The veterinarian may also order X-rays or ultrasoundUltrasound refers to sound waves that are above the hearing threshold of the human ear. In medicine, ultrasound is used for diagnostic imaging procedures to visualize internal organs, tissues, and blood flow. examinations if internal causes are suspected. The diagnostic measures depend on the suspected cause and the observed symptoms.

What the pet owner can do and professional therapy options

As a first step, pet owners should keep the affected skin areas clean and dry to minimize the risk of infections. Use lukewarm water and a mild, pH-neutral shampoo to clean the skin. Avoid harsh detergents that could further irritate the skin.

To relieve the itching, the pet owner can try to distract the cat from scratching and licking habits by offering toys or interactive activities. Applying an Elizabethan collar can also help prevent excessive scratching.

Ask your veterinarian about suitable topicalTopical refers to the direct application of medications or treatments to the skin or mucous membranes for a local effect, without being absorbed into the body. treatments or ointments that can support the healing process. In some cases, special medical creams or lotions may be prescribed to reduce inflammatory conditions and promote skin regeneration.

A balanced diet with additional omega-3 and omega-6 fatty acids can support skin health and relieve the symptoms of skin diseases. Talk to your veterinarian about appropriate supplements or special diets.

It is important to schedule regular follow-up visits with the veterinarian to monitor progress and adjust treatment if necessary. Stay in close contact with your veterinarian to ensure that your cat receives the best possible care.

Outlook on current research

Current research is intensely investigating why cats suffer from hard, hairless, flat growths on the skin, also known as plaquesPlaques are deposits or accumulations of substances on the inner or outer surfaces of body tissues. In veterinary medicine, they can occur on the skin, in blood vessels, or in the brain.. A significant aspect of the investigation is the role of the cat’s immune systemThe immune system is the body's defense system against infectious agents such as bacteria, viruses, fungi, and parasites. It comprises a complex network of organs, cells, and molecules that work together to protect the body.. Researchers suspect that an overreactive immune responseAn immune response is the immune system's reaction to foreign substances (antigens), such as microorganisms or proteins. It involves a series of processes aimed at recognizing, fighting, and eliminating these antigens. may play a role in the development of these plaques. This hypothesis is supported by the discovery that many affected cats also show other signs of allergic reactions or autoimmune diseasesAutoimmune diseases are conditions in which the immune system mistakenly attacks the body's own cells or tissues as if they were foreign substances. Examples in dogs and cats include autoimmune hemolytic anemia and systemic lupus erythematosus..

Another focus of research is on geneticsGenetics is the science of genes, heredity, and the variation of organisms. It studies how genetic information is passed from generation to generation and how it influences the development, appearance, and behavior of living things.. Studies suggest that certain breeds may be more susceptible to the formation of these plaquesPlaques are deposits or accumulations of substances on the inner or outer surfaces of body tissues. In veterinary medicine, they can occur on the skin, in blood vessels, or in the brain.. Genetic markers associated with an increased likelihood of developing these skin changes are being identified to better assess the risk in future generations.

Research is also examining environmental factors that may contribute to the development of plaquesPlaques are deposits or accumulations of substances on the inner or outer surfaces of body tissues. In veterinary medicine, they can occur on the skin, in blood vessels, or in the brain.. These include diet, stressStress refers to the state of an organism reacting to external stimuli or demands. In veterinary medicine, stress can have physical or psychological effects on animals, impacting their health and well-being., and exposureExposure refers to the Contact with or subjection to certain substances, environmental factors, or pathogens. In veterinary medicine, this can include Contact with toxins, allergens, or infectious agents that can cause health problems in dogs and cats. to certain chemicals or allergens. For example, some studies have shown that cats living in urban environments are more frequently affected by these skin changes than those in rural areas, possibly due to higher environmental exposureExposure refers to the Contact with or subjection to certain substances, environmental factors, or pathogens. In veterinary medicine, this can include Contact with toxins, allergens, or infectious agents that can cause health problems in dogs and cats..

Another research focus is on improving diagnostic methods. Currently, non-invasive techniques are being developed to detect and assess plaquesPlaques are deposits or accumulations of substances on the inner or outer surfaces of body tissues. In veterinary medicine, they can occur on the skin, in blood vessels, or in the brain. early on. Advances in imaging technology and biochemical analysis could enable more accurate and faster diagnoses in the future.

Regarding treatment, there are ongoing studies looking at new drug therapies. The focus is on developing drugs that specifically target the underlying mechanisms that lead to the formation of plaquesPlaques are deposits or accumulations of substances on the inner or outer surfaces of body tissues. In veterinary medicine, they can occur on the skin, in blood vessels, or in the brain.. This could reduce the need for invasiveInvasive describes medical procedures or pathogens that enter the body or penetrate tissue. In medicine, invasive procedures can range from minimally invasive techniques to open surgery. procedures and improve the quality of life for affected cats.

In summary, research into the development and treatment of plaquesPlaques are deposits or accumulations of substances on the inner or outer surfaces of body tissues. In veterinary medicine, they can occur on the skin, in blood vessels, or in the brain. in cats is a multidisciplinary field that is rapidly evolving. New insights from geneticsGenetics is the science of genes, heredity, and the variation of organisms. It studies how genetic information is passed from generation to generation and how it influences the development, appearance, and behavior of living things., immunology, and environmental science are helping to deepen the understanding of these skin changes and develop better therapeutic approaches.

Frequently asked questions

1. What are the most common causes of plaques in cats?

Plaques in cats can be caused by a variety of factors, including allergic reactions, infections, autoimmune diseases, and, in rarer cases, tumors. An accurate diagnosis can be made by a veterinarian who can identify the underlying causes.

2. How are plaques in cats diagnosed?

The diagnosis of plaques usually begins with a thorough clinical examination by a veterinarian. Often, further diagnostic tests are required, such as skin biopsies, blood tests, or allergy tests, to determine the exact cause of the skin changes.

3. Can plaques in cats be painful?

Plaques can be uncomfortable for cats, especially when accompanied by inflammatory conditions. The affected areas may itch or cause pain, leading to increased scratching or licking. Veterinary treatment can help relieve these symptoms.

4. Are plaques in cats contagious?

Plaques themselves are not contagious, however, the underlying causes, such as infections, can potentially be contagious. It is important to make an accurate diagnosis to determine if other animals in the household are at risk.

5. How are plaques in cats treated?

The treatment of plaques depends on the underlying cause. It may include topical treatments, medications to control infections or allergies, and in some cases, surgical procedures. A veterinarian will determine the best treatment strategy based on the individual situation of the cat.

6. Can plaques in cats disappear on their own?

In some cases, plaques may disappear on their own, especially if they are caused by a temporary reaction. However, it is important to treat the underlying cause to ensure that the plaques do not recur or worsen.

7. Do plaques affect a cat's quality of life?

Yes, plaques can affect a cat's quality of life, especially if they are itchy or painful. Timely veterinary treatment can help control the symptoms and improve the quality of life of the affected cat.

8. Can diet and lifestyle influence the formation of plaques?

Diet and lifestyle can certainly play a role in the formation of plaques. A balanced diet that is free of allergens, as well as a stress-free environment, can help reduce the risk of developing skin changes.

9. Is there a way to prevent plaques in cats?

While there is no foolproof method to completely prevent plaques, regular veterinary check-ups, a healthy diet, and avoiding potential allergens can reduce the risk. Prevention measures should be discussed with a veterinarian.

10. Should I worry if my cat has plaques?

If your cat develops plaques, it is important to see a veterinarian to determine the cause and receive appropriate treatment. While not all plaques are serious, they can be a sign of underlying health problems that should be addressed.