Dog ate chocolate?

ask a vet

What is this red lump on my dog's leg?

Species: Dog
Breed: rat terrier
Age: 8-11 years
dear dr marie,
in the last week this oozy boil-like bump has shown up on my dog`s leg what could it be ?
she has been constantly licking this boil .is this something we should be concerned?I am sending you 3 pictures named schandel 1,2 and 3 attached with my e mail regarding to how this red bump looks like.

thank you


Online vet, Dr. Marie

Dr. Marie replied:

Thank you for the excellent photos that you sent me of this red lump on your dog's leg. I have included one photo here:

red lump on dog's leg

It is always hard to talk about lumps without being able to feel and see the lump in person. While I can't give you a diagnosis online, I can tell you that I am a little concerned by what I am seeing.

There are a few possibilities for what this could be, but the two most common lumps that can look like this are either a mast cell tumor or a histiocytoma.

A mast cell tumor in this location (on the leg) has the potential to be serious. There are different grades of mast cell tumors and many of them can be cured with surgery. However, some can be serious types of cancers. Mast cell tumors can be itchy because they can release histamine.

A histiocytoma can look exactly like this as well. Fortunately a histiocytoma is not usually a serious issue. These lumps appear for no reason and then eventually after a month or two go away on their own with no treatment. Histiocytomas are more common on younger animals, but I have seen them in animals of all ages.

It could be something else like a reaction to an insect sting or a strange cyst or something else but I think that either a mast cell tumor or a histiocytoma are most likely.

I would highly recommend a vet visit as soon as possible for this. I don't mean to be alarmist, but if it is a mast cell tumor then the sooner it is dealt with the better. If it is a histiocytoma, well then at least you know you don't need to worry. The vet will do a test called a fine needle aspirate where they put a tiny needle in the mass and draw some cells out. Most dogs tolerate this really well. The vet will look at the cells under a microscope or may decide to send it to a lab to look at. It is usually quite easy to tell the difference between mast cell tumors and histiocytomas.

I hope everything goes well. I would really appreciate if you are able to post back to this question once you get a diagnosis.

Thanks,
Dr. Marie.


Do you have a pet website? Interested in learning more about SEO for Wix?


Check out our dog age calculator and cat age calculator.

Want to receive pet coupons, vet advice and info on new pet products in your inbox?

* indicates required

We'll only send you great stuff, never spam. Unsubscribe any time.

Disclaimer: Although Dr. Marie is a qualified veterinarian, the information found on this site is not meant to replace the advice of your own veterinarian. AskAVetQuestion.com and Dr. Marie do not accept any responsibility for any loss, damage, injury, death, or disease which may arise from reliance on information contained on this site. Do not use information found on this site for diagnosing or treating your pet. Anything you read here is for information only.

Customer reply:

thank you very much dr marie
that was very informative. I will keep you posted on the diagnosis.yesterday i had purchased an ointment called corona multipurpose for pets do you think that will work?


Online vet, Dr. Marie

Dr. Marie replied:

I am not familiar with this ointment but I can guarantee you that there is no ointment or cream that will take this away!



Search for similar questions:

ask a vet

Popular questions...

URTI in diabetic cat. Buster is a 14 year old male who weighs 16 pounds. He has had diabetes for 2-1/2... (12097 views)

Died after bloat surgery. My dog became sick early Friday morning (2am) and vomited 3 times between 2am and... (18277 views)

Overdose of drontal. My 9 week old kitten had an anti inflammatory injection, her first vaccine and we... (32043 views)

Puppy vomited and became unresponsive. My puppy violet was out on her walk this afternoon and she started dry reaching and... (8446 views)

Cat losing hair on neck and ears. My cat Bella is always throwing up hairballs. I also noticed that she has lost fur... (11487 views)

Cat with renal lymphoma. I have a 7 year old female cat who, over the course of the past six months,... (9568 views)

Diethylene glycol in chicken jerky. Do you know of any of the Chicken Jerky do treats that are made in China, has been... (5302 views)

How often to bathe a dog? I have a black lab that just turned 4. She has relatively short hair, how often... (8343 views)

Best ringworm treatment. We adopted Milo (5 months) from a shelter 2 weeks ago. He has two patches where skin... (11280 views)

Spinal cord lymphoma Hello Dr. Marie, Our angel puppy Oreo passed away last night. We decided to move... (11985 views)

See all questions...

Dr. MarieDr. Marie is a veterinarian who practices in a busy animal hospital in Ottawa, Ontario. She created Ask A Vet Question as a resource for good, accurate veterinary advice online. Dr. Marie treats dogs, cats, hamsters, guinea pigs, and rats. She has been a vet since 1999.

Is an online vet visit just as good as a trip to your veterinarian? No! But, many times, asking an online veterinarian a question can help save you money. While Dr. Marie can't officially diagnose your pet or prescribe medications, she can often advise you on whether a vet visit is necessary. You can also ask Dr. Marie for a second opinion on your pet's condition.