Cat Lump Under Chin

I can only imagine your horror as you tickle your cat or pet your cat by the chin, then all of a sudden you feel an obscure lump in that particular spot. And so you ask yourself, has that lump been there ever since? It could be really alarming and you start to think if your cat is in pain.

Well, while it can become a cause for concern, it does not hurt to learn more about the possible causes of these lumps. You will be surprised to know that there are lots of them! We’ll also discuss the symptoms and how to diagnose them!


Probable Causes, Symptoms, and Treatments

1. Abscesses

It is a condition where a tissue in the body becomes pus-filled. It could feel swollen, and warm to the touch. You would also notice an apparent redness. It may be attributed to infected bite wounds.


  • Quite firm because of the build-up of fluid.
  • Shape and size differ.
  • May be accompanied by fever, loss of appetite and lethargy.


  • Ask for a veterinarian’s help as this condition would entail surgery.

2. Allergy or dermatitis

The lump may be caused by an allergic reaction or irritation from contact with certain materials and chemicals. These include topical antibiotics; elements like plastic, wool, or rubber; and other irritating substances like household cleaning products.


  • If with direct contact, blistering may occur.
  • Apparent redness of the skin.
  • Hair loss around the area.


  • Antihistamines will help if the lump is caused by allergens. But in general, it will be best to prevent your cat from coming in contact with these irritants. Your vet will advise you if there is a need to shave your cat for better access to the infected area.

3. Tumors and cysts

Let us lump (Ha! Pun intended!) Together with all possible tumors and cysts here. There could be quite a lot of them. Basal cell tumors, benign tumors, fibroma, fibrosarcoma, follicular cysts, hemangiosarcoma, lipoma, melanoma, sebaceous gland tumors, squamous cell carcinoma, apocrine sweat gland cyst, to name a few.


  • Usually filled with fluid.
  • Rounded and smooth (possibly with no hair).
  • May become pigmented – bluish or reddish in color.


  • Early diagnosis is key because, upon consultation with experts, you will find out if there is a need to surgically remove these tumors and cysts. Surgery is highly likely in conditions like these.

4. Cancer

There is a possibility that your cat has developed cancer, thus the lump under its chin. These cancers may include, but not limited to epitheliotropic lymphoma, mammary cancer, mast cell tumor, skin cancer and others.


  • The affected area may become itchy.
  • Noticeable redness.
  • Varies in size but is often irregularly shaped
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  • Just like how the tumors and cysts are treated, cancer treatment would include surgical removal of the cancer cells, chemotherapy, and radiation. It depends on the advice of a health professional.

5. Fungal and bacterial infection

Infections caused by fungus and other bacteria may also be the culprit. These conditions could vary from coccidioidomycosis, cryptococcosis, histoplasmosis, nocardia, phaeohyphomycosis, pyoderma-deep, pythiosis, sporotrichosis and the likes.


  • Nodules that may ulcerate.
  • May be accompanied by fever and weight loss.
  • Skin lesions.
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    Apparent respiratory signs.


  • Medications such as antibiotics, ketoconazole, and itraconazole.

6. Skin conditions

It may also be caused by several skin conditions like feline acne, cutaneous horn, feline leprosy, feline pox, granulomas, nevi, among others.


  • Itching and swollen area.
  • Several nodules that may ulcerate.
  • Hair loss.


  • Treating these condition include the surgical removal of the invasive substance, anti-mycobacterial drugs, antibiotics for secondary infections that may arise, and antihistamines for itching.

7. Insect bites and parasites

Your cat might have come in contact with insects that are quite aggressive. Your cat might have been mistaken as a predator, or as in the case of parasites – your cat has become their gracious host. These insects and parasites include bees, wasps, hornets, chiggers or harvest mites, cuterebra, hookworms, mosquitos, spiders, ticks, and urticaria.


  • Swelling and redness in the bitten area.
  • Pain and itching.
  • Tiny bumps.
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    The appearance of nodules that has openings where larva is found.


  • Surgical removal becomes required especially when parasites are the culprit. Otherwise, antihistamines may be used.

Round Up 

Phew! That was quite a handful, isn't it? And it was only a summary of every possibility that may explain that lump in your cat's chin. The best thing to do will always be, find out with your vet and from there work on what you can do to treat it. 

Rebecca Welters

Yes, I am that weird cat lady with 200 cats and live in the darkest corner of the city where no one dares to go! Joking! But I am a cat lover and have 2 Ragdoll cats called Toby, he's 3 years old and Dory, she's 8 years old. I'm 36 years old and live in the quiet town of Washington.

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