Get

In Your Inbox

Catster is reader-supported. When you buy via links on our site, we may earn an affiliate commission at no cost to you. Learn more.

What Causes Lumps on Cats? 6 Possible Causes & What to Do

kitten with lump on skin

Imagine petting your cat and feeling something that doesn’t feel quite right. Is that a lump? Immediate concern and panic set in. As you pick up the phone to call your veterinarian, your mind is likely racing as to what this lump could possibly be. Continue reading below to learn more about six of the most common causes of lumps in cats.

divider 2 cats

The 6 Common Causes of Lumps on Cats:

1. Insect Bites

Fleas, ticks, and other insects can potentially bite or sting your companion, which can result in a lump or bump. Flea bites often cause several small bumps referred to as miliary dermatitis throughout their body, with a focus around the neck and tail base.

A single bump or localized swelling is more often found with other types of bites. In some cases, a palpable bump may actually be an attached tick. Appropriate preventative measures can help reduce the risk of parasitism.

If you need to speak with a vet but can't get to one, head over to PangoVet. It's an online service where you can talk to a vet online and get the advice you need for your pet — all at an affordable price!

PangoVet_Mention-in-Content for PangoVet2 save money


2. Cancer

Unfortunately, some lumps that develop on your cat can be cancerous. Malignant growths can metastasize and cause problems elsewhere in the body. Depending on the type of growth present, surgical removal may be recommended. In cases where surgical removal is not an option, radiation may be beneficial.

Historically, a common cancer that cats developed was coined injection site sarcoma. This type of cancer was often associated with an inflammatory reaction that occurred secondary to vaccine adjuvants. Nowadays, this type of cancer is less common, as non-adjuvanted vaccinations have been developed and utilized.

cat being observed by a female veterinarian
Image Credit: David Herraez Calzada, Shutterstock

3. Benign Growths

Some growths that develop can be benign, or non-cancerous. A well-known type of benign growth is a lipoma or fat. Other types of growths can occur as well that do not impact other parts of the body and do not spread.


4. Abscess

When an infection occurs and is walled off within the body, an abscess is formed. Abscesses can form an obvious lump consisting of pus, which is often warm and painful to the touch. Abscess can form for a variety of reasons; however, one of the most common reasons is from fighting with other cats.

Abscess may need to be surgically addressed, whereas others may improve with antibiotics and pain medication. Animals with abscesses can often appear systemically ill, showing signs of lethargy, fever, and decreased appetite.

abscess on cat's neck
Image Credit: Elena11, Shutterstock

5. Inflammation

Injury or trauma can cause inflammation to occur that can palpate as a bump. Depending on the underlying cause of inflammation, your veterinarian will formulate a plan to help bring relief to your pet.


6. Lymph Node Enlargement

Lymph nodes are an important part of the immune system, as they house white blood cells that respond to infections. Lymph nodes can become enlarged because of a nearby infection, whereas other times they can be enlarged due to cancer. There are places where lymph nodes are readily palpable on the body, including under the chin, near the clavicle, and behind the knees.

vet checking up a cat with the owner
Image Credit: Stock-Asso, Shutterstock

divider 1 paws

Diagnosing a Lump

When you find a bump on your cat, the first step in understanding the cause is to schedule an appointment with your veterinarian. Your veterinarian will listen to your concerns, inquire about your cat’s history, and perform a thorough physical exam. Based on their findings and suspicions, recommendations will be given to provide the best care for your pet.

When a lump is found, especially if an underlying cause like parasites or trauma isn’t identified, a fine needle aspirate may be recommended. Obtaining a fine needle aspirate is achieved by introducing a needle connected to a syringe into a mass and pulling out a sample of cells. The cells are then placed on a slide and evaluated under the microscope. The cells are closely studied, and a diagnosis is made.

Sometimes, a diagnosis may not be definitive, and additional testing may be necessary. Additional testing may include a tissue biopsy, bloodwork, or ultrasound.

female vet checking up the cat
Image Credit: Ermolaev Alexander, Shutterstock

Treatment

Treatment for lumps and bumps on your cat will be dependent on the underlying diagnosis. Infections like abscesses will require antibiotics, whereas cancerous growths will likely require removal and possibly additional care. Close collaboration with your veterinarian is critical!

It is important to keep your veterinarian up to date with your pet’s progress. If things are not improving in the way that is anticipated, it is possible a different approach is necessary.

divider 2 cats

Conclusion

Cats can develop lumps and bumps for a variety of reasons. If a new bump suddenly arises or if your pet seems to be in discomfort, it is important to schedule a consultation with your vet. Your veterinarian will perform a physical examination to help determine the underlying cause and discuss treatment options.

See also:


Featured Image Credit: Mironmax Studio, Shutterstock

Want content like this delivered to you?

Sign Up For Our Newsletter

News, insights, expert advice, and everything cat

* By submitting, you agree to our Terms & Conditions and Privacy & Cookies Policy.

How useful was this post?

Click on a star to rate (you can leave written feedback after clicking submit)

Help us improve Catster for pet parents!

Your feedback really matters.

What did you like about this post? Also how can we improve it?

Join the conversation

Leave a Reply

You’re very welcome to leave a comment or question. Please know that all comments must meet our community guidelines, and your email address will NOT be published. Let’s have a positive and constructive conversation.

Talk With A Vet Online

Peace of mind,
anywhere, anytime

Affordable vet advice

Can Cats Have CBD Treats? Vet-Verified Safety & Benefits Explained

You might’ve noticed all the hype about CBD (cannabidiol) in recent years. Maybe you’ve even tried it yourself. In people, CBD has been...

Can Cats Eat Sauerkraut? Vet-Approved Facts & FAQ

Sauerkraut is a food that generates strong opinions. Most people fall into one of two categories with sauerkraut: They either hate it or...

1,200-Year-Old ‘Biscuit-Making’ Paw Prints Found by Archaeologists Suggest the Habit is Not Just for Modern Cats

The adorable feline phenomenon of ‘biscuit-making’ has taken social media by storm over the past few years, with some owners even going so...

The Remarkable Russian Blue: Comparing Olga to the Breed Standard

Hi, I’m Christopher! Read my introduction to learn more about me and my silly Russian Blue cat, Olga. I didn’t know much about...

More related

Can Steroids Cause Diabetes in Cats? Our Vet Explains the Side Effects

Steroids are commonly used in veterinary medicine for various reasons but mainly as anti-inflammatories. While steroids may seem like miracle drugs that often...

You Want To Know What??? Answering Our Readers’ Strangest Questions

Hi, I’m Dr. Karyn! Read my introduction to learn more about me and meet my five hilarious cats: Clutch, Cyril, Alex, Zelda, and...

Help for Soldiers’ Pets: Guardian Angels & Other Pawesome Organizations

Our companions give us so much love, devotion, and friendship throughout their all-too-short lifetimes. When soldiers have pets, it’s often a gamble for...

Why Is My Cat Gagging? 7 Vet-Reviewed Reasons

If you’ve recently seen your cat gagging, you may wonder what causes it and whether you should be concerned. Gagging is a confusing...

Keep reading

Why Does My Kitten Climb Me Like a Tree? 6 Vet-Reviewed Reasons & How to Stop it

Your little rascal has already won their way into your heart, but maybe you don’t want to sacrifice your new pants or sensitive skin to their shredding claws. Kittens sometimes climb their humans like they would climb a tree for...

Kitten climbing on a person's tree

Why Do I Need to Clean My Cat’s Litter Box? 10 Vet Reviewed Reasons & Cleaning Tips

As a cat owner, you know that cleaning the litter box is definitely the least pleasant chore associated with caring for your feline friend. However, keeping your cat’s litter box clean is also one of the most important things you...

cat-pooping-outside-the-litter-box

My Cat Smells Like Poop: 5 Vet-Verified Reasons & Solutions

There’s almost nothing better than your daily cuddle with your feline friend. One of the big draws of owning a cat is their cleanliness—a trait that cats are known for—but sometimes, you may detect a foul smell coming from your...

woman with smelly cat

Is It Cruel to Keep My Cat Indoors? Vet-Reviewed Verdict & Facts

Cats are inquisitive, adventurous animals that enjoy exploring their surroundings. However, they prefer sticking close to their home territory. Some cats are born outdoors and live a feral life on the streets with no human companions to care for them....

cat-meowing-or-trilling-by-the-door

Are Forget-Me-Nots Toxic to Cats? Vet-Reviewed Houseplants Examined

If you’re a flower fanatic, you have undoubtedly seen and adored the lovely forget-me-not. Woodland forget-me-nots (Myosotis sylvatica) are a species of perennial plants with stunning blue flowers. Fans of forget-me-nots prize the delicate flowers with white or yellow eyes....

Catster_Are Forget-Me-Nots Toxic to Cats

Alternatives to Declawing Your Cat: 8 Humane Options

On paper, declawing your cat might seem like a simple way to stop your furniture from being ripped to shreds, but the reality is that it’s a cruel and painful operation that can lead to long-term pain, discomfort, and behavioral...

cat claw

Can Cats Eat Dates? Vet-Verified Nutrition Info & Facts

Can cats eat dates? The answer is not that simple. Although dates are not toxic for cats, meaning they can eat them, there are several health risks associated with this fruit when it comes to cats. Therefore, it’s best to...

Can Cats Eat Dates

Why Do Kittens Sometimes Die Suddenly? Vet-Verified Causes & Facts

Having a litter of newborn kittens in your house can be a cause for celebration, but it can sometimes also cause heartache. These tiny little bundles of fluff are incredibly fragile, and sometimes you might wake up to find that...

newborn kitten in man's hand