Finding a growth on your dog can be concerning, especially when you notice a new lump, bump, or mass under or on the skin. Dog skin growths can have many possible causes, including cysts, lipomas, skin tags, warts, inflammation, and other types of masses.
Some growths remain small and unchanged for a long time, while others may become larger, irritated, painful, ulcerated, or start bleeding. Because different conditions can look similar, the appearance of a lump alone cannot reliably determine what it is.
This guide explains the common types of growths on dogs, how they can look and feel, where they commonly occur, what changes to watch for, and when veterinary examination is appropriate.
What Does a Growth on a Dog Mean?
A growth on a dog is a general term for an unusual lump, bump, mass, swelling, or raised area that develops on or underneath the skin.
A growth may be:
- Small or large
- Soft or firm
- Smooth or rough
- Movable or attached to surrounding tissue
- Skin-colored, pink, red, white, brown, or black
- Flat, raised, or hanging from the skin
- Slow-growing or rapidly changing
The word growth does not describe one specific disease. It is simply a way to describe something abnormal that has developed on the body.
Possible causes include:
- Cysts
- Lipomas
- Skin tags
- Warts or papillomas
- Abscesses
- Inflammation
- Benign skin masses
- Mammary masses
- Oral growths
- Other tumors or tissue masses
A veterinarian may need to examine or test a growth to determine its actual cause.
Growth vs Lump vs Bump on a Dog
Dog owners may use the words growth, lump, bump, mass, and skin growth to describe the same thing.
These terms are useful when searching for information, but they do not necessarily identify a particular medical condition.
For example, a lump on a dog may be located within the skin or underneath it. A bump on a dog may describe a raised area that is easier to see or feel. A mass is a broader medical term for an abnormal collection or growth of tissue.
Therefore, a new lump or bump should be evaluated based on its characteristics rather than its name.
What Does a Dog Skin Growth Look Like?
Dog skin growths can look very different from one another.
You may notice a growth that is:
Soft or Firm
Some lumps feel soft or rubbery, while others are noticeably firm.
Movable or Attached
Some masses can move slightly beneath the skin when touched, while others feel attached to the surrounding tissue.
Smooth or Rough
A skin growth may have a smooth surface, while warts and papillomas can have a rough or cauliflower-like appearance.
Small or Large
A growth can range from a tiny raised spot to a much larger mass.
Skin-Colored, Pink, Red, White, or Black
The color of a growth can vary depending on the type of lesion, pigmentation, irritation, inflammation, bleeding, or other factors.
Color alone cannot determine whether a growth is harmless or serious.
Slow-Growing or Rapidly Growing
Some growths remain relatively stable, while others increase in size over a short period.
A rapidly changing growth deserves veterinary attention.
Common Types of Dog Skin Growths
There are many possible types of skin growths and masses in dogs.
Cysts
A cyst is a sac-like structure that can contain fluid, keratin, or other material.
Cysts may appear as round or raised lumps and can occur in different areas of the body. Some remain stable, while others can become irritated or infected.
Lipomas
Lipomas are fatty masses that commonly develop under the skin.
They are often soft and may move slightly beneath the skin. Even when a lump feels like a typical fatty mass, a veterinarian should determine what it is rather than relying on touch alone.
Skin Tags
Skin tags are pieces of excess tissue that may appear as small raised or dangling growths.
They can be particularly noticeable where skin rubs against skin or around areas of friction.
Warts and Papillomas
Warts, also known as papillomas, may appear as rough or cauliflower-like growths.
They can occur on the skin and around the mouth. A wart-looking growth should still be evaluated if it changes significantly, bleeds, becomes painful, or continues to grow.
Abscesses and Inflamed Areas
An infection or localized inflammation can produce a swollen lump that may be warm, painful, red, or tender.
An abscess can sometimes develop after an injury, bite, puncture, or foreign object enters the skin.
Other Benign Masses
Dogs can develop other non-cancerous skin and tissue masses.
Because benign and potentially serious masses can sometimes look similar, veterinary examination may be necessary to identify the type of growth.
Potentially Cancerous Masses
Some masses can be associated with cancer.
This does not mean that every unusual growth is cancer. However, a new, rapidly changing, ulcerated, bleeding, or otherwise concerning mass should be evaluated rather than diagnosed based on appearance alone.
Growth on a Dog’s Leg
A growth on a dog’s leg can develop on the skin, underneath the skin, or near a joint.
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A leg growth may be small and stable or may gradually become larger.
Pay attention if it:
- Grows quickly
- Becomes painful
- Bleeds
- Becomes ulcerated
- Causes persistent licking
- Interferes with walking
- Changes in color or texture
Growth on a Dog’s Head
A growth on a dog’s head can occur on the skin or beneath it.
You might notice:
- A small lump
- A firm bump
- A soft mass
- A wart-like growth
- A raised skin lesion
- A swelling that was not previously present
Some normal structures can feel prominent depending on the dog’s anatomy, so not every bump represents a disease.
However, a new or unusual lump should be monitored and discussed with a veterinarian if it persists or changes.
Growth on a Dog’s Lip
A growth on a dog’s lip can be especially noticeable because the area is exposed and easy to see.
Possible appearances include:
- Small bumps
- White growths
- Pink or red masses
- Wart-like lesions
- Swelling around the lip
- Rough or cauliflower-like tissue
Growths around the mouth can have different causes, including papillomas and other oral or skin masses.
Do not attempt to remove a lip growth yourself.
Growth on a Dog’s Ear
A growth on a dog’s ear can occur on the outer ear or surrounding skin.
Watch for:
- Rapid enlargement
- Bleeding
- Crusting
- Persistent scratching
- Swelling
- Pain
- Discharge
- Repeated irritation
A persistent or changing ear growth should be examined by a veterinarian.
Growth on a Dog’s Nipple
A lump or growth around a dog’s nipple can involve the skin or mammary tissue.
Pay attention to a new lump that:
- Continues growing
- Becomes firm
- Changes shape
- Becomes painful
- Develops an open area
- Produces discharge
A veterinarian can determine whether a lump is associated with the nipple, mammary tissue, skin, inflammation, or another type of mass.
Growth on a Dog’s Gums
A growth on a dog’s gums is an oral growth rather than a typical skin growth.
You may notice:
- A raised area
- A pink or red mass
- A firm lump
- Bleeding
- Bad breath
- Excessive drooling
- Difficulty chewing
- Difficulty eating
Persistent or growing oral masses should be examined by a veterinarian, particularly when they bleed or interfere with eating.
Growth Under a Dog’s Skin
Not every lump is visible on the surface.
A growth under a dog’s skin may feel like a small, soft, firm, or movable lump when you gently examine your dog’s body.
Under-the-skin masses can have different causes, including fatty masses, cysts, inflammation, or other tissue growths.
If you discover a new lump beneath your dog’s skin, note its location and approximate size and monitor it for changes. Veterinary evaluation may be appropriate, particularly if it grows or develops other concerning characteristics.
What Does a Small Growth on a Dog Mean?
A small growth on a dog is not necessarily a serious problem.
Small skin growths can include cysts, skin tags, warts, and other masses.
However, size alone does not determine whether a growth is harmless. A small growth that changes quickly, bleeds, becomes painful, or develops an unusual appearance should be checked.
What About a Large Growth on a Dog?
A large growth on a dog may be more noticeable and can sometimes interfere with movement or normal activities.
A large mass should be evaluated by a veterinarian, particularly if it continues to grow or becomes painful, ulcerated, or irritated.
Do not assume that a large growth is cancerous simply because of its size. Different types of masses can become large.
What Is a Bumpy or Rough Growth on a Dog?
A bumpy growth on a dog may have an uneven, raised, rough, or irregular surface.
Some warts and papillomas can have a cauliflower-like appearance. Other types of masses can also appear irregular.
A rough or bumpy appearance cannot by itself confirm what a growth is.
What If a Growth on a Dog Is Bleeding?
A bleeding growth on a dog should not be ignored.
A mass can bleed if it is scratched, rubbed, bitten, injured, or otherwise irritated. Some growths can also develop an ulcerated surface that bleeds.
Bleeding does not automatically mean that a growth is cancerous, but repeated or unexplained bleeding is a reason to contact a veterinarian.
If your dog is actively bleeding, prevent further scratching or licking if possible and seek veterinary guidance.
What Does a Black Growth on a Dog Mean?
A black growth on a dog can have different explanations.
Dark coloration may be associated with pigmentation, dried blood, a scab, or the characteristics of a particular skin lesion or mass.
Because color alone cannot identify a growth, a new or changing black growth should be evaluated when appropriate.
What Does a Red Growth on a Dog Mean?
A red growth on a dog may be irritated, inflamed, or associated with another type of skin lesion.
If the area is swollen, painful, bleeding, rapidly changing, or repeatedly irritated, veterinary evaluation is recommended.
What Does a White Growth on a Dog Mean?
A white growth on a dog can have several possible causes.
A white bump may be associated with keratin, a cyst, a wart-like lesion, or another type of growth.
The color and appearance alone are not enough to determine the cause.
What Is a Black Cauliflower Growth on a Dog?
A black cauliflower growth on a dog may look rough, raised, and irregular.
Cauliflower-like growths are often associated with wart-like lesions, but other masses can have irregular surfaces too.
If the growth is new, changing, bleeding, painful, or rapidly enlarging, have it examined by a veterinarian.
When Should a Dog’s Growth Be Checked by a Vet?
Contact your veterinarian if you notice a growth that:
- Appears suddenly
- Grows rapidly
- Changes size or shape
- Changes color
- Becomes painful
- Bleeds repeatedly
- Develops an open wound
- Becomes ulcerated or crusted
- Produces discharge
- Causes persistent licking or scratching
- Interferes with walking
- Interferes with eating
- Is located inside the mouth
- Continues changing over time
A veterinarian can determine whether the growth should simply be monitored or whether diagnostic testing is appropriate.
How Do Veterinarians Diagnose a Dog Growth?
A veterinarian will usually begin with a physical examination.
They may consider:
- Where the growth is located
- How large it is
- How long it has been present
- Whether it has changed
- Whether it is painful
- Whether it is attached to surrounding tissue
- Whether the skin around it is irritated
Depending on the situation, additional testing may be recommended.
Fine-Needle Aspiration
A fine-needle aspiration can collect cells from a mass for examination.
Cytology
The collected cells may be examined to look for characteristics that help identify the type of lesion or mass.
Biopsy
A biopsy involves taking a tissue sample for further examination when more information is needed.
The appropriate diagnostic method depends on the individual growth and your veterinarian’s assessment.
Can a Dog Growth Be Removed?
Some dog growths can be removed surgically when removal is medically appropriate.
A veterinarian may consider removal when a growth:
- Is repeatedly irritated
- Bleeds or becomes damaged
- Interferes with movement
- Affects eating
- Continues growing
- Causes discomfort
- Needs to be removed for diagnosis
- Requires treatment based on its characteristics
The recommended approach depends on the type, size, location, and behavior of the mass.
Do not cut, squeeze, puncture, or attempt to remove a dog growth at home.
How to Monitor a Growth on Your Dog
If your veterinarian recommends monitoring a growth, keep a simple record of changes.
Record:
- Date first noticed
- Location
- Approximate size
- Color
- Texture
- Whether it is movable or firm
- Whether your dog reacts when it is touched
- Any bleeding or discharge
Taking photographs from time to time can also help you notice changes in size or appearance.
Avoid repeatedly squeezing or manipulating the growth.
Can You Tell if a Dog Growth Is Cancerous by Looking at It?
No. The appearance of a growth cannot reliably determine whether it is cancerous.
Some harmless masses can look unusual, while potentially serious masses may initially appear small or ordinary.
Veterinary examination and, when appropriate, diagnostic testing are more reliable ways to determine what a mass represents.
Frequently Asked Questions About Growths on Dogs
What are the most common causes of growths on dogs?
Possible causes include cysts, lipomas, skin tags, papillomas, warts, inflammation, abscesses, benign masses, and other types of tissue growth.
Is every growth on a dog cancer?
No. Dogs can develop many benign lumps and skin growths. However, you cannot reliably determine whether a mass is harmless or cancerous from appearance alone.
Why does my dog have a growth on his leg?
A leg growth can have several possible causes, including a cyst, lipoma, skin lesion, inflammation, or another type of mass. A veterinarian can determine whether further testing is needed.
Why is my dog’s growth bleeding?
A growth may bleed after being scratched, rubbed, injured, or irritated. Some masses can also become ulcerated. Repeated bleeding should be evaluated by a veterinarian.
What does a wart-looking growth on a dog mean?
A wart-looking growth may be a papilloma or another type of skin lesion. Appearance alone cannot confirm the diagnosis.
Should I squeeze a growth on my dog?
No. Avoid squeezing, cutting, puncturing, or attempting to remove a growth yourself. Manipulating a mass can cause irritation, bleeding, or infection.
Should I worry about a small growth on my dog?
A small growth is not automatically dangerous, but size alone does not determine what it is. Monitor for changes and ask your veterinarian about new or changing growths.
When is a growth on a dog an emergency?
Prompt veterinary attention is appropriate when a growth is associated with significant bleeding, severe pain, rapid swelling, difficulty eating, difficulty walking, or other sudden serious symptoms.
Key Takeaway
A growth on a dog can describe many different types of lumps, bumps, masses, and skin lesions. Some are benign, while others require further investigation.
Pay attention to a growth’s size, location, texture, color, growth rate, and changes over time. New, rapidly growing, painful, ulcerated, or repeatedly bleeding growths should be evaluated by a veterinarian.
Do not try to diagnose or remove a growth at home. When in doubt, professional examination is the safest way to determine what the mass represents.