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Why does my cat have brown or black crust on his nose? Is it serious?

Updated On September 23rd, 2025

Pet's info: Cat | Mixed Breed | Male | unneutered | 6 lbs

Hello! So for awhile my cat has had like a brownish/blackish crust in and around his nose that I have been cleaning. Lately it seems like there’s more of it. He hasn’t ever presented any other symptoms that have been worrisome so I never thought much about it but I heard it could mean something bad? Could this be normal or do y’all think I should take him in for this? Thanks! ❤️ (some pics below of stuff I’ve cleaned off for reference)

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2 Answers

Most Helpful Answer

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Answered By Jenna Beyer, DVM, MBA, cVMA

Veterinarian, Certified Veterinary Acupuncturist

Published on October 9th, 2020

The crusts are caused by the nose running just a little, then it mixes with skin cells and bacteria or yeast to turn brown. Some cats can have a low-grade chronic upper respiratory infection to cause it. In some of these cats, a supplement called lysine can help (see link below). If the skin under the crusts appears normal, then I would just continue to clean gently with a warm wet washcloth daily. https://www.amazon.com/VetriScience-Laboratories-Vetri-Lysine-Bite-Sized/dp/B002ALE9RM/ref=sr_1_1?dchild=1&keywords=lysine+treats&qid=1602343461&sr=8-1

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    Answered By Ricardo Fernandez, DVM

    Veterinarian, Veterinary Oncology Resident

    Published on July 7th, 2018

    Thanks for using Petco Pet Education Center, formerly Petcoach! This may be nasal secretions from something like an upper respiratory infection. I recommend that you have him evaluated by a veterinarian for further assessment and treatment. They would be able to check for this possibility and treat accordingly. Good luck and have a good night!

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