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My dog has a painful lumpy bump with a pinhole on his leg. What is it?

Updated on September 23rd, 2025

Pet's info: Dog | Chihuahua | Male | neutered | 4 years and 1 month old | 7.7 lbs

Just found a round hard lumpy blister like wart or cyst on our small dogs leg. It has like a pin hole in the centre. He doesn't seem distressed but does warn us away when we touched it.

1 Answer

Most Helpful Answer

Laura Johnson VMD

Answered By Laura Johnson VMD

Veterinarian

Published on December 19th, 2017

Hi, thanks for using Petco Pet Education Center, formerly Petcoach!

It's hard to see the bump when the picture enlarges. Based on your description it could be a sebaceous adenoma which can have a brown dot in the center because they produce a waxy brown discharge. They are benign and some dog breeds grow a lot of them over time. Sadly many skin bumps can look the same. I always recommend when a new lump is found or an established one grows or changes to have it checked by your Vet. If it is small enough and Neeko is a calm dog some vets can remove skin masses with local anesthesia.

I hope this helps and I wish Neeko the very best!
Vote Icon1Pet Parents found this answer helpful

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