Why is my dog getting random bumps on his skin

Common Bumps On Dogs Skin And What They Mean

Finding a bump or lump on your dog can immediately send you spiraling trying to figure out what it is.

Is it just a fatty tumor? Is it cancerous? Do you need to worry?

We reached out to Dr. Corinne Wigfall, a veterinarian working with SpiritDog Training, and Dr. Justin Padgett, a veterinarian at Branchville Animal Hospital, to learn more about the different kinds of bumps on dogs' skin.

Common types of bumps on dogs skin

There are dozens, if not hundreds, of different types of lumps and bumps that dogs can get. Some are harmless, while others might mean something more serious is going on.

And you may even notice these bumps on your dog more often as he gets older but that doesnt always mean theyre a cause for concern!

As they age, the lumps and bumps increase as their cellular defense mechanisms break down and tumors (benign and malignant) are free to proliferate more readily, Dr. Padgett told The Dodo.

Some of the most common bumps and lumps you may find on your dog include:

1. Lipomas

These are benign fatty tumors that are typically harmless. Lipomas are usually soft and squishy and will probably move around under your fingers. They usually arent tender to the touch, so your pup likely wont even notice it.

2. Sebaceous cysts

According to Dr. Padgett, sebaceous cysts are cauliflower-looking growths that are full of gray, pasty material (this material can be liquid or semi-liquid). They arent cancerous, but you should still get them checked out (and possibly removed) if theyre bothering your pup.

3. Papillomas

Papillomas are oral warts typically found in your dogs mouth as a result of having papilloma virus. They usually grow in clusters and can sometimes become cancerous, so theyre always good to get checked.

4. Skin tags

Skin tags are pretty common on dogs (especially older pups), so youve likely seen one or two before. They arent cancerous and are often long, thin pieces of skin that hang off of your pup.

5. Haematomas

These are blood blisters under the skin most commonly seen in the ear. These arent cancerous, but your pup will have to get surgery in order to remove it.

6. Abscesses

An abscess is a painful bump or swelling that can sometimes fill up with pus. They should always be checked out (and usually drained) by a vet so that they dont rupture on their own and cause an infection.

7. Cancerous masses

These are various types of bumps that can be cancerous, like mast cell tumors (cancer of the immune system), melanoma (skin cancer) and mammary carcinoma (breast cancer).

While it can be difficult to know just by looking which bumps are cancerous or not, if a growth seems to have appeared overnight, is larger than the typical bumps your dog has had, and is painful or hard, you should get it checked out ASAP.

Dogs can have multiple bumps or lumps on the skin, and each one can have a different origin, so [they] all need testing by a veterinarian at least once, Dr. Wigfall told The Dodo.

What causes lumps and bumps on your dogs skin?

Some lumps and bumps are caused by different cancers or skin conditions, and others can be caused by skin infections or even allergic reactions.

When it comes to skin infections, Dr. Wigfall said that those can present as lots of small, raised bumps on the skin, while allergic reactions can present as big welts all over the body that come and go within 72 hours.

When to take your dog to the vet

Any lump or bump should be checked by a veterinarian as soon as possible.

Owners should be concerned about growths that grow quickly, are firm to the touch, appear to contain a lot of inflammation and those that are bothersome/painful for the dog, Dr. Padgett said.

What your veterinarian finds will determine how the bump is treated, if at all. If it is a bacterial infection, antibiotics or surgery can resolve the issue, Dr. Wigfall said. If it is a non-cancerous growth, such as a wart [or] skin tag, you may choose to leave it alone and only surgically remove it if it is growing too big and causing a problem for the animals mobility or is getting caught and infected.

If the bump is determined to be cancerous, itll require surgical removal and be tested to figure out if any further treatment is needed.

So while many bumps on dogs' skin will be OK and nothing to worry about, its always a good idea to get them checked out by your vet just in case.

Skin lumps and bumps: what to look for on your dog

Its always nerve-wracking for pet owners to find lumps on their dogs. There are several different kinds of bumps that can show up on your dog, including:

Abrasion. Also known as minor cuts and scrapes, these injuries are common in dogs and can leave behind a small bump.

Allergic dermatitis (allergies). Dogs with dermatitis from allergies can experience symptoms in the form of rashes, red bumps, inflammation, and hair loss.

Alopecia. Some dogs experience moderate to severe itchiness when dealing with alopecia or hair loss, resulting in skin thats red, inflamed, thickened, oozing, or bleeding. They might also break out in papules (red spots), pustules (pimples), plaques, or hives.

Bug bites. Bites from insects like ticks, fleas, mosquitoes, and ants all cause small red bumps to form on a dogs skin.

Fatty tissue inflammation. Clinically known as steatitis, the swelling of the fat cells just underneath the skin can cause bumps that may be painful for your dog.

Folliculitis. Inflammation of a dogs hair follicles causes red, raised bumps to form on the skin.

Hot spots. These spots are a type of skin infection that begins as a small itchy bump or patch of skin and spreads rapidly as dogs lick and scratch at them.

Interdigital cysts. These growths are found between your dogs toes, also called digits. Interdigital cysts are typically caused by underlying conditions such as allergies, atopic dermatitis, or obesity.

Mange. Demodectic and sarcoptic mange are easily treatable infections caused by mites. Symptoms show up in the form of redness, rashes, and lesions on the ear margins, as well as the chest, elbows, hocks, and tummy.

Ringworm. A fungal infection known to affect dogs with weakened immune systems, ringworm affects the hair, nails, and coat in the form of hair loss, scaliness, scabs, and crusty areas.

Skin tumors. While there are a few different types of skin tumors, studies showTrusted SourceNC State Veterinary MedicineVeterinary school.Go to source that about 60% to 80% of them are benign in dogs, but always work with your vet if you suspect a skin tumor on your dog.

Yeast dermatitis. More commonly known as a yeast infection, these infections are caused by Malassezia pachydermatis, a type of fungus. Its common in dogs and causes dry, itchy, flaky, red, smelly, hardened, or hyperpigmented skin. It can also show up on the paws or in the ears.

Warts. These small lesions are usually found on a dogs head and face and are caused by the canine papilloma virus (CPV). Some warts may need to be surgically removed if theyre inflamed, infected, or fail to regress over time.

If you notice a new bump on your dogs skin, its best to get it checked out by your vet.

Lumps on your dog that need vet care

A minor cut may not need immediate veterinary care, but some lumps and bumps are more serious. These types of lumps will need veterinary care:

Abscess. These pockets of pus appear suddenly as a painful swelling that may be either firm to the touch or squishy like a water balloon.

Sebaceous cyst. These mostly benign cysts appear as swelling under a dogs skin and are caused by clogged oil glands.

Lipoma. A lipoma is a common benign tumor of fat seen in older pets. While they can grow anywhere on a dogs body, they usually only become problematic when they grow in locations that cause discomfort or impact their ability to walk.

Histiocytoma. Another common type, this tumor mostly affects dogs younger than 6 years old. These tumors are sometimes removed because of ulceration, infection, bleeding, and the chance that they may proliferate, though most regress on their own after a few months. Thats why histiocytoma is technically considered a type of cancer, though cell overgrowth typically regresses once the stimulus is removed.

Soft tissue sarcoma. This term covers a wide range of tumors, including those that arise from a dogs connective, muscle, or nervous tissues. Theyre caused by the abnormal production of cells in an uncontrolled manner.

Mast cell tumor. Mast cell tumors (MCTs) are one of the most common types of skin cancers in dogs. They form when the mast cells in the connective tissue start rapidly dividing, and theyre often raised, reddened, and itchy.

Squamous cell carcinoma. Squamous cell carcinomas (SCCs) are tumors that form as a result of abnormal cell growth in the topmost layer of the skin, also known as the squamous layer. They usually appear as a single lesion in one location, but theres also a rare kind of SCC called multicentric squamous cell carcinoma (also known as Bowens disease or Bowenoid carcinoma) that presents as multiple lesions in multiple locations on the body.

Lumps, Bumps, and Cysts on Dogs

Types of Lumps and Bumps on Dogs

Here are several common skin growths found in dogs, along with info on what they look like and what to watch for:

Benign Tumors

Tumors that are benign are not invasive or likely to spread to other body areas.

Histiocytoma

A histiocytoma is a benign skin growth that usually occurs in dogs less than 2 years of age. They are found on the front half of a dogs body, usually on the head or legs. Rarely, they can be seen in older dogs or on other areas of the body.

Histiocytomas are pink and fleshy but may get bigger and seem more irritated before improving. These tumors usually regress spontaneously over time without treatment and arise from the skins immune cells. They can be diagnosed through microscopic examination of a sample of cells from the growth.

Lipoma

A lipoma may show up anywhere on a dogs body but is common on the trunk and legs. Lipomas come from fat cells under the skin or are found in muscle tissue. They usually develop in older, overweight dogs. They may become quite large or appear in multiple locations.

A vet can diagnose a lipoma by taking a small sample of cells from the growth to look for fat droplets. No treatment is needed, but these should be monitored for rapid changes. They will gradually enlarge with time, and may bother your dog if theyre located in an area that interferes with motion. When lipomas start to bother your pet, you can consider surgical removal.

Papilloma

A papilloma in young dogs is a contagious, wart-like growth that usually occurs in and around the mouth. In older dogs, they might be seen around the eyes or on other areas of the body. Papillomas are caused by a virus that can be spread through direct contact with an infected dog or contaminated items, such as toys or feeding bowls.

They appear small, fleshy, and round with a cauliflower-like texture to the surface. Many will dry up and fall off within a few months as the dogs immune system matures. Severe cases may make eating or swallowing difficult and require treatment by surgical removal. Medications and other treatment methods are also available, including crushing of the warts to stimulate the immune system.

Another type of papilloma is a skin wart that is more common in older dogs. These are usually solitary and not caused by a virus. These bumps may have a hardened surface that looks like a cauliflower. An inverted papilloma may also be seen in young adult dogs, especially on the lower abdomen. If the growth bothers the pet, surgical removal is an option.

Skin Tag

A skin tag grows in places where a dogs skin rubs together. They are overgrowths of the connective tissue in the skin. They are the same color as the skin but extend out from the surface on thin stalks.

Skin tags are common in older dogs and certain breeds. No treatment is needed, but these can be surgically removed if they are bothersome.

Sebaceous Gland Tumor

A sebaceous gland tumor is commonly found in older dogs. They are typically smaller than a pea and may develop in any location. Some will bleed or secrete a material that forms a crust. Large breeds often form these on their head, specifically their eyelids, and they may be black in color. Treatment is not necessary, but surgical removal may be considered when the growth is bothersome.

Meibomian

A meibomian gland tumor is a slow-growing benign lump that forms in the meibomian gland at the edge of the eyelid. The tumor can stick out or grow into the eyelid. They may become inflamed, irritated, painful, or ulcerated. They may also cause inflammation of the cornea and conjunctiva.

Large tumors may cause problems when your dog blinks, because they cause extra tearing and tear staining. They are diagnosed by their appearance and location, and they can be removed with surgery, or the tissue can be frozen for removal. They rarely grow back after removal, but regrowth is possible.

Epulis

An epulis is a common benign growth found in the mouth of dogs. They may form when a tooth rubs against the gums, as with an underbite in brachycephalic (flat-faced) breeds.

These smooth, fleshy, pink bumps grow on the gum tissue near the outer surface of an incisor, canine, or premolar tooth. They can appear to grow on a stalk of tissue, like a mushroom, or as an unmoving mass, and they may have a bony interior. Certain types can invade surrounding bony tissue.

Diagnosis of an epulis is made by recognizing it from appearance and confirming with a biopsy. An x-ray of your dogs head will show if it has invaded surrounding tissues. These growths should be removed surgically, along with the adjacent tooth and any bony tissue that may be affected. They do not usually regrow if the entire tumor is removed. Radiation therapy may help cases where the growth is inoperable.

Follicular Cysts

Follicular cysts are large, benign bumps on the skin that grow up from the hair follicle. They may release a thick material that is white, yellow, or brown when you push on them. As they get bigger, they can become itchy or painful.

These types of cysts are diagnosed on physical examination and may be confirmed with microscopic examination of a small sample of cells aspirated with a needle. Follicular cysts may become infected and require antibiotic treatment. If they are growing or become painful, they may be surgically removed and should not regrow.

Perianal Adenomas

Perianal adenomas are benign growths common in older, unneutered male dogs. They grow from oil glands near the anus but can also occur in similar glands along the abdomen, on the back, and near the tail.

These commonly show up as multiple small lumps. Larger tumors may develop bleeding ulcerations and can compress the anal canal, making it difficult for your dog to poop.

Almost all male dogs are cured by castration alone, but large or ulcerated tumors may also be surgically removed. Females improve with surgical removal, but the growths often recur. Laser surgery or freezing the growth may be necessary to avoid fecal incontinence when surgery involves the anal sphincter.

Hemangiomas

Hemangiomas are benign tumors that occur in adult dogs and closely resemble blood vessels. You usually see them on a dogs legs and trunk. They may be single growths or multiple, compressible, reddish-black circular lumps that can resemble a blood blister. Some may become large and even ulcerate. The recommended treatment is surgical removal.

Nevus

A nevus is a dark raised or flat benign growth on the skin, commonly called a mole. These are found on areas prone to trauma, such as the legs, head, and neck, usually in older dogs. Treatment is surgical removal.

Trichoepitheliomas

Trichoepitheliomas are small, benign lumps that pop up from the hair follicles of adult dogs. They are cyst-like and filled with condensed, yellow, cheesy, granular material. They can occur anywhere on the body, but especially on the face and trunk. Treatment is surgical removal, but they are likely to continue to form at other locations, even after surgery.

Cornifying epitheliomas

Cornifying epitheliomas are benign growths that stick up from the skin surface and look like horns. They arise from hair follicles and may form anywhere on a dogs body, but they are more common on the back, tail, and legs of adult dogs. No treatment is necessary unless there is evidence of self-trauma, ulceration, or secondary infection. Surgical removal is the ideal treatment.

Basal Cell Tumors

Basal cell tumors are benign growths that develop on the head, ears, neck, and forelimbs of older dogs. They are raised swellings that are typically firm, solitary, dome-shaped, and small. Some may be hairless, ulcerated, and stick out like stalks from the surface of the skin. They are dark in color and may form cysts that break open and drain fluid or pus. Treatment is surgical removal, especially when the dog is uncomfortable.

Malignant Tumors

Malignant tumors are cancerous growths that can invade tissue and spread to organs.

Angiosarcomas

Angiosarcomas are highly malignant blood vessel tumors that may vary in appearance. One or more red lumps in the skin or underlying soft tissue are commonly seen, but they may also appear as a poorly defined bruise.

All types grow rapidly and destroy surrounding tissue. They also spread to the lungs and liver. Angiosarcomas may occur in response to sun exposure in dog breeds with short, white coats, but dogs with dark, thick coats can develop them as well.

They usually form on the underside of the trunk, hip, thigh, and lower legs. A biopsy is required for a diagnosis. Freezing and laser surgery can help control smaller surface tumors. Surgical removal is needed for tumors below the skins surface. Chemotherapy may also be recommended to treat any remaining tumor cells.

Basal Cell Carcinomas

Basal cell carcinomas are flattened or raised growths that appear anywhere on the body of an older dog. They may spread to surrounding skin, forming new ulcerations, but they rarely spread to other organs. Surgical removal is recommended, including enough skin around the tumor to ensure that no tumor cells remain.

Liposarcomas

Liposarcomas are rare but may develop in older male dogs on the chest and legs. They can be soft or firm lumps that are slow to spread to other locations. Treatment is surgical removal, but recurrence is common. If this happens, radiation treatment may also be required.

Lymphosarcoma

Lymphosarcoma rarely develops directly on a dogs skin but may be seen as a surface tumor or along with internal tumors. It can look like flaky skin, red patches, raised and ulcerated areas, or lumps deep within the skin.

There are two forms of skin lymphosarcoma that differ in their expected progression and response to treatment, so it is important to determine which type your dog has early on. Treatments include surgical removal, chemotherapy, and radiation, done separately or combined. These treatments may improve the signs of the disease but do not lengthen the dogs life expectancy.

Mast Cell Tumors

Mast cell tumors are the most common malignant tumor seen in dogs. They often affect older dogs but can occur in dogs of any age.

They develop solitary growths anywhere on the body, especially the limbs, lower abdomen, and chest. Larger or rapidly growing tumors and those in certain locations are more likely to spread. Their appearance can greatly vary, but most are raised and either soft or firm to the touch.

Your vet will need to examine a sample of cells from the growth under a microscope to confirm a diagnosis. There is variation on how aggressive these tumors are. Surgical removal is necessary. If the tumor regrows or spreads, other treatments, including chemotherapy and radiation, may be used.

Malignant Melanomas

Malignant melanomas are another type of skin tumor of older dogs. They commonly develop on the lips, mouth, and nail beds of male dogs. They appear as raised, ulcerated lumps and may be dark, light gray, or pink. If they appear in the nail bed, the toe is often swollen.

These tumors grow quickly and may spread quickly to other organs. Complete surgical removal is the preferred treatment, but it may be difficult and involves removal of adjacent tissue to prevent recurrence. Chemotherapy and radiation are not effective treatment options. A vaccine is available that helps shrink the size of the tumor, which may prolong your dogs life expectancy.

Fibrosarcomas

Fibrosarcomas are common, fast-growing malignant tumors in dogs. Most are on the trunk and legs and vary in appearance and size. Those under the skins surface appear lumpy, while those deep under the skin may be firm and fleshy.

They can invade underlying muscles, but most do not spread to other areas of the body. Treatment consists of surgical removal, though complete removal may not be possible, and regrowth is common. Fibrosarcomas may also be treated with radiation and chemotherapy.

Squamous Cell Carcinomas

Squamous cell carcinomas can be found in two places on a dog: on the surface of the skin or under a nail. Most appear as firm, raised, irregular, and ulcerated areas. Many are solitary, but areas of prolonged sun exposure may produce multiple tumors. These growths invade surrounding tissues. Some are slow to spread, while others grow more rapidly. Treatment involves complete surgical removal of the tumor along with some normal tissue.