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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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1 Answer

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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