Why is my gray cat's fur turning rusty brown under his neck?

Question

A small portion of my gray cat's fur ( right under his neck) is turning a light rusty brown. What are some potential causes of this? Additional info: He is about 4 years old, neutered, and has a special diet to to a history of urinary crystals and inflammation/partial blockage. He is very prone to anxiety, EXTREMELY active, and grooms himself a lot. Pet's info: Cat | Domestic Shorthair | Male | neutered | 4 years and 2 months old | 12.6 lbs

Elva Ma DVM · Accepted Answer

Hello, and thank you for your question. Zuko is such a handsome kitty! Occasionally focal areas of skin can get darker after it has healed after a period of inflammation. This can cause a concurrent change in the hair colour. In this location under the neck, a common cause of inflammation is chin acne, for example. If the fur and skin is otherwise looking healthy in this area, I would recommend to monitor it. If there is any concurrent scaling, redness, or itchiness, I would take Zuko to the vet within the next few days to rule out ongoing infection, or allergies, etc. I hope this helps!

Why is my gray cat's fur turning rusty brown under his neck?

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