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My dog has a ruptured yellow lump on her back. What should I do?

Updated on September 23rd, 2025

Pet's info: Dog | German Shepherd | Female | spayed

Hey I just gave my German sheperd a wash, and i noticed this on her back in her coat. She only has one. And she is not in any discomfort. When combing her it appears to have torn however I'm not sure what it is. Yellow ball like puss came out? Thought I would ask on here as my vet is not open until tomorrow. Is there anything I can do for her?

2 Answers

Most Helpful Answer

Daniel Fonza, DVM

Answered By Daniel Fonza, DVM

Veterinarian

Published on November 10th, 2019

Hi there and thank you for using Petco Pet Education Center, formerly Petcoach! From the pictures, it appears as though this is a cyst. I would clean this using a combined solution of water and betadine (mix until light brown) and keep the area clean. The cyst will likely close back up now that it has ruptured. If it continues to drain material or becomes infected, then I would have a veterinarian take a look at this and plan to have it removed. I hope this helps! Please let me know if you have any other questions or concerns and I would be more than happy to help you further.
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Related Answers from Veterinarians

  • Answered By Daniel Fonza, DVM

    Veterinarian

    Published on November 10th, 2019

    These are typically what we call sebaceous cysts and commonly open up when caught on a comb during grooming. There is nothing you can do to reduce the occurrence of these cysts. They will start to show up in middle to older aged animals. If you want to avoid these opening up during grooming, then I would speak with a veterinarian about having these surgically removed.

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    1Pet Parents found this answer helpful

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