![]() Mast cell tumors (MCT) – Mast cell tumors account for approximately 20% of all skin tumors that occur in dogs.Learn more about bruising and bleeding in dogs. Bruising can also occur from abnormal bleeding disorders. Most often this is associated with some trauma, such as being hit by a car or other wound. Hematoma – A hematoma is a bruise that can be blue to black in color.Most sebaceous cysts do not require treatment. These can appear as small bumps and are considered benign, but may become open and infected. Cysts – A sebaceous cyst is a small sac containing an accumulation of secretions produced by the sebaceous glands.They can appear as pink raised lesions or have pigmentation if there is blood inside the lesion. Blisters – A blister is a small fluid-filled bubble on the skin most often caused by friction, burning, or other damage.They are benign and often spontaneously resolve. Histiocytomas can be diagnosed by microscopic examination of a sample of the lump. Some dogs will lick at histiocytomas, which can cause a pigmented appearance. They most often occur on the face and legs. Histiocytomas – A histiocytoma is a small, raised lump that primarily occurs on young dogs under three years of age.Surgical removal can be curative, though more warts may form elsewhere on the body. For these reasons, some dog warts are surgically removed. These benign masses are generally not a concern, but can break open, become nicked during grooming, or become infected. This is most noticeable in white- or light-haired dogs. Some dogs will also lick these lesions, which causes additional pigmentation to the wart and the hair around it. Most warts are pale in color although, when infected or traumatized, many will appear dark from the inflammation or blood. They are generally raised and look like small pale cauliflower bumps. Warts – Canine viral papilloma, also known as dog warts, are one of the most common causes of small lumps in dogs.Clipping and cleaning the area will often reveal if an abscess is the underlying cause of the skin pigmentation. Punctures or bites can turn into abscesses. The skin over the abscess is generally abnormal in color, and can range from red to bruised/black. Abscesses – An abscess is a localized pocket of infection that contains pus.Punctures can occur from trauma or from a bite wound from another animal. Punctures – A puncture can appear as a black bump in dogs.Insect bites – A bite, such as one from a wasp, bee, or spider can cause local skin inflammation that appears as a pigmented bump.For example, this can be dried chewing gum, food, or a plant burr. Foreign bodies – Something caught in the hair next to the skin can be mistaken for a pigmented lump.Clipping the hair and careful close examination can usually reveal that a pigmentation is a scab and not a tumor. Scabs can be large or small and are often pigmented. Scabs – A scab is a rough, dry crust that forms as a protective barrier over a healing cut, laceration, puncture, or wound.Learn more about how to remove a tick from a dog. ![]() Veterinarians commonly remove ticks from dogs that were mistaken for small-pigmented skin lumps. Ticks are irritating arthropods that prey on dogs and attach themselves to the skin as they take their blood meals. Ticks – A tick can be confused with a pigmented lump or black bump.There are many possible causes for pigmented or black lumps on dogs. Causes of Pigmented or Black Lumps on Dogs First, let’s look at all the possible causes of black lumps in dogs and then we will offer additional information about melanomas. The most dangerous cause of a pigmented lump or bump on the skin is melanoma. This is correct since, just as with people, dogs can also get skin cancer. The concern often stems from how human medicine has educated us about the dangers of skin cancer. Pigmented lumps or black lumps on dog skin can cause pet parents to panic. What Does a Black Lump on a Dog’s Skin Mean?
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