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My dog's sebaceous cyst popped and oozed. Does he need a vet?

Updated On September 23rd, 2025

Pet's info: Dog | Flat-Coated Retriever | Male | neutered | 10 years and 10 months old | 95 lbs

My dog has had a growth on the skin of his shoulder for several years, which grew to the size of a grape., likely a sebaceous cyst. My vet did take a sample years ago and I knew it was benign. Over the weekend, after it started oozing black material, I pressed it and expressed lots of black or grey gunk. It is now a deflated little skin sack. My question is do I need to take him in to the vet and what will they do if I do? It seems fine. and I will clean it and watch for infection.

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1 Answer

Most Helpful Answer

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Answered By Rebecca, DVM

Veterinarian

Published on September 5th, 2017

Sebaceous cyst will often fill with thick material and often you are able to pop or express the material from the cyst. As long as it is not painful, inflamed, or has bloody or purulent discharge there's no need to take Brennan immediately to the vet. The cyst will likely fill up again, they usually will not completely go away without surgical removal of the entire system lining. But as long as it's not bothering him and is not becoming infected, often times monitoring is all you need to do. I hope this answers your question, thank you for using Petco Pet Education Center, formerly Petcoach.

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