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Skin hyperpigmentation in Dogs

Author: Dr. med. vet. Gisa Löwe | Last modified: 17.02.2026

When to visit the vet?

Non-urgent see a veterinarian within 2–3 days

If the condition worsens / symptoms persist, consult a veterinarian.

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

Definition

Skin hyperpigmentationHyperpigmentation is a skin condition in which certain areas of the skin become darker than the surrounding skin. This can be caused by an overproduction of melanin, sun exposure, inflammatory conditions, or other factors., also known as hyperpigmentationHyperpigmentation is a skin condition in which certain areas of the skin become darker than the surrounding skin. This can be caused by an overproduction of melanin, sun exposure, inflammatory conditions, or other factors., is a condition in which a dog’s skin appears darker than normal. This change can occur locally or widespread and is often an indicationIndication refers to a valid reason or rationale for using a specific treatment, medication, or medical procedure. It is based on the diagnosis and the patient’s clinical condition. of an underlying disease or a symptom of another health problem.

Can Occur with the Following Diseases:

Basics and possible causes

The skin of dogs contains melanocytes, specialized cells that produce the pigment melaninMelanin is a pigment found in the skin, hair, and eyes of animals (including humans). It determines color and provides protection from UV radiation. Conditions affecting melanin production can lead to changes in coloration.. MelaninMelanin is a pigment found in the skin, hair, and eyes of animals (including humans). It determines color and provides protection from UV radiation. Conditions affecting melanin production can lead to changes in coloration. gives the skin its color and protects it from UV radiation. Increased melaninMelanin is a pigment found in the skin, hair, and eyes of animals (including humans). It determines color and provides protection from UV radiation. Conditions affecting melanin production can lead to changes in coloration. production can lead to hyperpigmentationHyperpigmentation is a skin condition in which certain areas of the skin become darker than the surrounding skin. This can be caused by an overproduction of melanin, sun exposure, inflammatory conditions, or other factors.. This overproduction can be triggered by a variety of factors.

One of the most common causes of hyperpigmentationHyperpigmentation is a skin condition in which certain areas of the skin become darker than the surrounding skin. This can be caused by an overproduction of melanin, sun exposure, inflammatory conditions, or other factors. in dogs is chronicChronic refers to a condition or disease that is long-lasting or permanent. Chronic diseases often develop slowly and can lead to persistent or recurring health problems over time. inflammation of the skin. This inflammation can be caused by allergies, parasites, or infections. ChronicChronic refers to a condition or disease that is long-lasting or permanent. Chronic diseases often develop slowly and can lead to persistent or recurring health problems over time. irritation and inflammation stimulate melaninMelanin is a pigment found in the skin, hair, and eyes of animals (including humans). It determines color and provides protection from UV radiation. Conditions affecting melanin production can lead to changes in coloration. production, leading to a darkening of the skin.

Hormonal disorders such as Cushing’s syndromeA syndrome is a group of symptoms that occur together and indicate a specific disease or condition. A syndrome can be caused by various factors and is often complex in its diagnosis and treatment. or hypothyroidism can also cause hyperpigmentationHyperpigmentation is a skin condition in which certain areas of the skin become darker than the surrounding skin. This can be caused by an overproduction of melanin, sun exposure, inflammatory conditions, or other factors.. These conditions affect the body’s metabolism and hormoneHormones are chemical messengers produced by endocrine glands and released into the bloodstream to affect specific cells or organs in the body. They regulate numerous bodily functions, including growth, metabolism, and reproduction. production, which can influence skin pigmentation. In Cushing’s, caused by an overproduction of cortisolCortisol is a steroid hormone produced in the adrenal cortex. It plays an important role in the body's stress response, as well as in the metabolism of proteins, lipids, and carbohydrates. Cortisol also helps regulate blood sugar levels and suppress the immune system., skin thickening and darkening can occur.

Genetic factors can also play a role. Certain breeds, such as Dachshunds, are naturally prone to hyperpigmentationHyperpigmentation is a skin condition in which certain areas of the skin become darker than the surrounding skin. This can be caused by an overproduction of melanin, sun exposure, inflammatory conditions, or other factors.. This genetic predispositionA predisposition is an innate inclination or susceptibility of an organism to certain diseases or conditions. In dogs and cats, there may be a genetic predisposition to certain conditions such as hip dysplasia or certain heart diseases. can be exacerbated by environmental factors or health problems.

Another factor can be the reaction to medication. Some medications can affect pigment production or triggerA trigger is a stimulus that elicits a specific reaction or state. In veterinary medicine, this can refer to emotional responses, such as fear or aggression, or medical conditions, such as seizures in dogs and cats. allergies, which in turn can lead to increased pigmentation.

Typical accompanying symptoms

Skin thickening: HyperpigmentationHyperpigmentation is a skin condition in which certain areas of the skin become darker than the surrounding skin. This can be caused by an overproduction of melanin, sun exposure, inflammatory conditions, or other factors. is often accompanied by skin thickening, which can feel leathery or rough. This change can indicate chronicChronic refers to a condition or disease that is long-lasting or permanent. Chronic diseases often develop slowly and can lead to persistent or recurring health problems over time. inflammation.
Itching: Many dogs with hyperpigmentationHyperpigmentation is a skin condition in which certain areas of the skin become darker than the surrounding skin. This can be caused by an overproduction of melanin, sun exposure, inflammatory conditions, or other factors. also experience itching. This can be a sign that an allergic reaction or 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. is the cause.
Hair loss: Hyperpigmented skin areas can also show hair loss. This is often associated with an underlying dermatological condition.
Redness or inflammation: In addition to darkening, the skin may also be red or inflamed, indicating acuteAcute refers to a condition that occurs suddenly and is usually of short duration. In a medical context, it describes symptoms or illnesses that can quickly become serious and require immediate attention. or chronicChronic refers to a condition or disease that is long-lasting or permanent. Chronic diseases often develop slowly and can lead to persistent or recurring health problems over time. irritation.
Odor development: In some cases, the affected skin may develop an unpleasant odor, especially if 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. is present.

When to see a vet?

Eskalation: ORANGE for severe Itching, inflammation/infection, foul odor, or rapid spread. RED for severe general illness.

A visit to the vet is necessary if the hyperpigmentationHyperpigmentation is a skin condition in which certain areas of the skin become darker than the surrounding skin. This can be caused by an overproduction of melanin, sun exposure, inflammatory conditions, or other factors. appears suddenly or worsens rapidly. Such changes can indicate an acuteAcute refers to a condition that occurs suddenly and is usually of short duration. In a medical context, it describes symptoms or illnesses that can quickly become serious and require immediate attention. condition that requires immediate attention.

If your dog shows symptoms such as loss of appetite, lethargy, or weight loss in addition to increased pigmentation, it is important to consult a vet quickly. These signs could indicate a systemic disease.

Even if the hyperpigmentationHyperpigmentation is a skin condition in which certain areas of the skin become darker than the surrounding skin. This can be caused by an overproduction of melanin, sun exposure, inflammatory conditions, or other factors. is associated with severe itching or pain, the dog should be presented to a vet to clarify the cause and initiate appropriate treatment.

Symptom recognition for the pet owner and veterinary diagnostic procedure

For the pet owner, it is important to monitor symptoms and document changes in skin color. Photos can be helpful to track the progressionProgression refers to the advancement or worsening of a disease over time. It describes an increase in the severity or extent of the disease symptoms. of hyperpigmentationHyperpigmentation is a skin condition in which certain areas of the skin become darker than the surrounding skin. This can be caused by an overproduction of melanin, sun exposure, inflammatory conditions, or other factors. and show them to the vet.

The vet will take a thorough 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 causes of hyperpigmentationHyperpigmentation is a skin condition in which certain areas of the skin become darker than the surrounding skin. This can be caused by an overproduction of melanin, sun exposure, inflammatory conditions, or other factors.. This may include questions about feeding, medication, environmental factors, and the dog’s 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..

A physical examination will be performed, during which the vet will examine the affected skin for signs of 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., inflammation, or other changes. Skin tests, such as scraping or a biopsyA biopsy is a medical procedure in which a small amount of tissue is removed from the body to be examined under a microscope for signs of disease. Biopsies can help diagnose cancer and other conditions., may be necessary to determine the cause of the hyperpigmentationHyperpigmentation is a skin condition in which certain areas of the skin become darker than the surrounding skin. This can be caused by an overproduction of melanin, sun exposure, inflammatory conditions, or other factors..

Blood tests may be performed to rule out hormonal imbalances or systemic diseases. These tests can help diagnose conditions such as Cushing’s syndromeA syndrome is a group of symptoms that occur together and indicate a specific disease or condition. A syndrome can be caused by various factors and is often complex in its diagnosis and treatment. or hypothyroidism.

What the pet owner can do and professional therapy options

One of the first measures a pet owner can take is to avoid known allergens or irritants that could affect the dog’s skin. A hypoallergenic diet or removing potentially irritating substances from the dog’s environment can be helpful.

Regular bathing with a gentle, moisturizing shampoo can help soothe the skin and relieve itching. However, it is important not to use harsh or heavily perfumed products, as these can further irritate the skin.

If the dog is taking medication, it is important to follow the vet’s instructions exactly and not to change or discontinue dosages without consultation. Regular check-ups by the vet can ensure that the treatment is effective.

Another important step is regular monitoring of the dog’s skin condition. Early detection of changes can help prevent major problems and adjust treatment in a timely manner.

Outlook on current research

Increased skin pigmentation, known as hyperpigmentation, is increasingly considered a relevant topic in veterinary medicine. Current studies focus on better understanding the biological mechanisms behind this skin change. A key area of research deals with the role of melanocytes, the cells that produce melaninMelanin is a pigment found in the skin, hair, and eyes of animals (including humans). It determines color and provides protection from UV radiation. Conditions affecting melanin production can lead to changes in coloration., the pigment responsible for skin color. Researchers are investigating how genetic factors and environmental conditions influence the activity of these cells, which can lead to increased pigmentation. The role of hormones and inflammatory mediators that can stimulate or inhibit melaninMelanin is a pigment found in the skin, hair, and eyes of animals (including humans). It determines color and provides protection from UV radiation. Conditions affecting melanin production can lead to changes in coloration. production is also being investigated.

Another significant research area is the development of diagnostic methods to differentiate between normal pigmentation and pathologicalPathological refers to anything related to diseases or their processes. Pathological changes are those that deviate from the normal structure or function and indicate a disease. changes. Advances in imaging diagnostics, such as the use of dermatoscopes and confocal laser microscopy, allow for a more precise analysis of skin structure and pigment distribution. These technologies help veterinarians detect hyperpigmentationHyperpigmentation is a skin condition in which certain areas of the skin become darker than the surrounding skin. This can be caused by an overproduction of melanin, sun exposure, inflammatory conditions, or other factors. at an early stage and distinguish it from other skin diseases. By refining these diagnostic techniques, researchers hope to intervene early to treat possible underlying diseases.

Therapeutic research is exploring various approaches to treating hyperpigmentationHyperpigmentation is a skin condition in which certain areas of the skin become darker than the surrounding skin. This can be caused by an overproduction of melanin, sun exposure, inflammatory conditions, or other factors.. This includes research into 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 that inhibit melaninMelanin is a pigment found in the skin, hair, and eyes of animals (including humans). It determines color and provides protection from UV radiation. Conditions affecting melanin production can lead to changes in coloration. production, as well as systemic therapies that target the underlying causes. A significant focus is also on investigating the effects of antioxidants and anti-inflammatory agents that could help improve skin health and regulate pigmentation. Clinical studies are attempting to evaluate the effectiveness of these therapeutic approaches and minimize potential side effects.

An emerging field of research is the genetic analysis of dog breeds that have a predispositionA predisposition is an innate inclination or susceptibility of an organism to certain diseases or conditions. In dogs and cats, there may be a genetic predisposition to certain conditions such as hip dysplasia or certain heart diseases. for hyperpigmentationHyperpigmentation is a skin condition in which certain areas of the skin become darker than the surrounding skin. This can be caused by an overproduction of melanin, sun exposure, inflammatory conditions, or other factors.. By studying genetic markers, scientists want to understand why certain breeds are more frequently affected and how genetic mutations influence melaninMelanin is a pigment found in the skin, hair, and eyes of animals (including humans). It determines color and provides protection from UV radiation. Conditions affecting melanin production can lead to changes in coloration. production. This research could ultimately lead to the development of breeding programs that reduce the incidenceIncidence refers to the number of new cases of a disease or condition that occur within a specific time period in a specific population group. It provides information about the risk of contracting the disease. of hyperpigmentationHyperpigmentation is a skin condition in which certain areas of the skin become darker than the surrounding skin. This can be caused by an overproduction of melanin, sun exposure, inflammatory conditions, or other factors..

In summary, research into hyperpigmentationHyperpigmentation is a skin condition in which certain areas of the skin become darker than the surrounding skin. This can be caused by an overproduction of melanin, sun exposure, inflammatory conditions, or other factors. in dogs is taking place on several levels. From molecular research into melaninMelanin is a pigment found in the skin, hair, and eyes of animals (including humans). It determines color and provides protection from UV radiation. Conditions affecting melanin production can lead to changes in coloration. production to the development of new diagnostic techniques and the evaluation of therapeutic approaches – all these efforts aim to deepen the understanding of this skin change and develop effective treatment strategies.

Frequently asked questions

What is hyperpigmentationHyperpigmentation is a skin condition in which certain areas of the skin become darker than the surrounding skin. This can be caused by an overproduction of melanin, sun exposure, inflammatory conditions, or other factors. in dogs? HyperpigmentationHyperpigmentation is a skin condition in which certain areas of the skin become darker than the surrounding skin. This can be caused by an overproduction of melanin, sun exposure, inflammatory conditions, or other factors. in dogs is an increased pigmentation of the skin, which visually appears as darker skin patches. This change can be caused by an increased production of melaninMelanin is a pigment found in the skin, hair, and eyes of animals (including humans). It determines color and provides protection from UV radiation. Conditions affecting melanin production can lead to changes in coloration., the pigment that gives the skin its color.
Which areas of the body are most commonly affected? HyperpigmentationHyperpigmentation is a skin condition in which certain areas of the skin become darker than the surrounding skin. This can be caused by an overproduction of melanin, sun exposure, inflammatory conditions, or other factors. often occurs in areas of high friction or pressure, such as armpits, groin, and abdomenThe abdomen, also known as the abdominal cavity, is the part of the body located between the rib cage and the pelvis. It houses several important organs, including the stomach, liver, kidneys, intestines, and spleen.. However, it can also occur on other parts of the body, depending on the underlying cause.
How can I tell if my dog has hyperpigmentationHyperpigmentation is a skin condition in which certain areas of the skin become darker than the surrounding skin. This can be caused by an overproduction of melanin, sun exposure, inflammatory conditions, or other factors.? Increased pigmentation often manifests as a darkening of the skin. If you notice that certain areas of the skin are darkening, you should consult a vet to clarify the cause.
Can hyperpigmentationHyperpigmentation is a skin condition in which certain areas of the skin become darker than the surrounding skin. This can be caused by an overproduction of melanin, sun exposure, inflammatory conditions, or other factors. disappear on its own? In some cases, hyperpigmentationHyperpigmentation is a skin condition in which certain areas of the skin become darker than the surrounding skin. This can be caused by an overproduction of melanin, sun exposure, inflammatory conditions, or other factors. can recede on its own, especially if the underlying cause is treated. However, it is important to identify the cause and, if necessary, have it treated by a vet.
Is hyperpigmentationHyperpigmentation is a skin condition in which certain areas of the skin become darker than the surrounding skin. This can be caused by an overproduction of melanin, sun exposure, inflammatory conditions, or other factors. in dogs painful? HyperpigmentationHyperpigmentation is a skin condition in which certain areas of the skin become darker than the surrounding skin. This can be caused by an overproduction of melanin, sun exposure, inflammatory conditions, or other factors. itself is usually not painful. However, if inflammation or other skin problems are present, this can lead to discomfort or pain.
What treatment options are available for hyperpigmentationHyperpigmentation is a skin condition in which certain areas of the skin become darker than the surrounding skin. This can be caused by an overproduction of melanin, sun exposure, inflammatory conditions, or other factors.? The treatment depends on the cause. These may include 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, dietary changes, or medications that reduce inflammation. It is important to diagnose the exact cause to choose the most effective treatment.
Can certain dog breeds be more susceptible to hyperpigmentationHyperpigmentation is a skin condition in which certain areas of the skin become darker than the surrounding skin. This can be caused by an overproduction of melanin, sun exposure, inflammatory conditions, or other factors.? Yes, certain breeds may be genetically more susceptible to skin changes such as hyperpigmentationHyperpigmentation is a skin condition in which certain areas of the skin become darker than the surrounding skin. This can be caused by an overproduction of melanin, sun exposure, inflammatory conditions, or other factors.. These often include breeds with skin wrinkling or darker skin.
Can I prevent the development of hyperpigmentationHyperpigmentation is a skin condition in which certain areas of the skin become darker than the surrounding skin. This can be caused by an overproduction of melanin, sun exposure, inflammatory conditions, or other factors. in my dog? Good skin care, a healthy diet, and regular veterinary check-ups can help reduce the risk of developing hyperpigmentationHyperpigmentation is a skin condition in which certain areas of the skin become darker than the surrounding skin. This can be caused by an overproduction of melanin, sun exposure, inflammatory conditions, or other factors.. It is important to detect and treat skin problems early.
What role do hormones play in hyperpigmentationHyperpigmentation is a skin condition in which certain areas of the skin become darker than the surrounding skin. This can be caused by an overproduction of melanin, sun exposure, inflammatory conditions, or other factors.? Hormones can play a significant role in melaninMelanin is a pigment found in the skin, hair, and eyes of animals (including humans). It determines color and provides protection from UV radiation. Conditions affecting melanin production can lead to changes in coloration. production. Hormonal imbalances can increase melaninMelanin is a pigment found in the skin, hair, and eyes of animals (including humans). It determines color and provides protection from UV radiation. Conditions affecting melanin production can lead to changes in coloration. production and thus lead to hyperpigmentationHyperpigmentation is a skin condition in which certain areas of the skin become darker than the surrounding skin. This can be caused by an overproduction of melanin, sun exposure, inflammatory conditions, or other factors..
Should I be concerned if my dog develops hyperpigmentationHyperpigmentation is a skin condition in which certain areas of the skin become darker than the surrounding skin. This can be caused by an overproduction of melanin, sun exposure, inflammatory conditions, or other factors.? It is advisable to consult a vet if you notice changes in your dog’s skin pigmentation. HyperpigmentationHyperpigmentation is a skin condition in which certain areas of the skin become darker than the surrounding skin. This can be caused by an overproduction of melanin, sun exposure, inflammatory conditions, or other factors. can be a symptom of an underlying condition that should be treated.