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My dog has a red lump on her ear. Is it serious? Should I see a vet?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed Medium (23 - 60lb) | Female

Hey, my three year old cavoodle has a red lump on her right ear. I'm not sure how serious it is and if I need to take her to the vet?

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Answered By Ana M, DVM

Veterinarian

Published on October 2nd, 2019

Thank you for submitting your question regarding your Rosie. I recommend that she sees her veterinarian. A procedure known as a fine needle aspirate will likely be performed. The veterinarian will use a small needle to collect a sample of cells to evaluate under the microscope. This will help the veterinarian diagnose the mass. There is a benign growth known as a histiocytoma. Unfortunately, it has the same outward appearance as an aggressive form of skin cancer called a mast cell tumor. I hope this information helps!

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