What are these brown spots in my cat's eye? Are they serious?

Question

My cat has brown patches in one eye. She appears well and healthy but I'm concerned. She has been this way for several months. Pet's info: Cat | Mixed Breed | Female | spayed

Dr. Strydom, DVM · Accepted Answer

It is not uncommon for cats to develop brown or black spots on the iris. A pigmented area on the iris can be benign or malignant, and differentiating them is sometimes difficult. My guess is that these spots are what we call iris nevus. These are benign (like freckles). Since she has so many, this would be called iris melanosis. Iris melanosis is classified as benign, but in time, it may progress to a malignant melanoma. Although melanomas are rare in cats, the eye is the most common site for it to show up. The first hint that this could be melanoma is rapid growth. If you know the spot(s) is getting larger quickly, that is a warning sign. If the shape of the pupil has become deformed as it dilates and constricts, that is another potential red flag. I suggest you have Dixie examined by your vet to get a diagnosis. She needs a thorough exam with a ophthalmoscope. Hope this helps. Best wishes.

What are these brown spots in my cat's eye? Are they serious?

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