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My dog has a bleeding lump that looks like a cyst. Is it serious?

Updated On September 23rd, 2025

Pet's info: Dog | Bullmastiff | Male

My dog has a cyst looking think on him. Its not affecting his behaviour or anything. But today I noticed its started to bleed and has been opened up

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1 Answer

Most Helpful Answer

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Answered By Sarah Derksen, DVM

Veterinarian

Published on July 26th, 2018

Hi. Unfortunately this looks like more then a cyst. This could be a cancerous tumor that has become irritated and ulcerated. Based on this photo , it appears it should be removed and biopsied. If it isn't a cancerous tumor and is largely a cyst of some kind, it would still be best to remove it because of how irritated it is. It will eventually bother Adel a lot as well

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