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Why does my cat's damp, red-brown skin smell like mushrooms?

Updated On September 23rd, 2025

Pet's info: Cat | American Shorthair | Female | spayed | 11 months and 18 days old

I have a kittypical that is about 11 months old. I've noticed she is always damp as if she is sweaty and smells like mushrooms. When she gets bathed the water rinses a red brown color. She has very thin hair and sometimes it will be crusted down to her skin. Today I came home and she was laying on the bed, drenched in this red brown fluid. Yes, she has ear mites that we are currently treating. I was told twice that she doesnt have mange. What is wrong with her? Help!

1 Answer

Most Helpful Answer

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Answered By Menolly Cote, DVM, CVA

Veterinarian, Certified Veterinary Acupuncturist

Published on July 19th, 2017

The most likely cause for water to turn red brown when rinsing off an animal is due to the presence of fleas. Flea poop, also known as flea dirt, turns red brown when it gets wet. Some cats may have an allergic reaction to flea bites causing severe scabbing or crusting of their skin and thinning hair. Given the severity of what you're describing, I would recommend that you have Lucky seen by your veterinarian. Left untreated, flea infestations can cause severe anemia. Your veterinarian may recommend checking Lucky's red blood cell level for anemia. They can also recommend flea treatments for Lucky and for your home to help solve the problem. Please keep in mind that many over-the-counter flea treatments are not safe for cats. Please make sure to read all packaging carefully.

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