My cat has dark skin patches from allergies. Should I be concerned?

Question

My cat is being investigated for grain allergies. And has had episodes of itchy inflamed skin and hair loss. Advised to switch to feeding fish and rice (kitty will not eat rice), and in the areas that were sore, the skin has become hyperpigmented. He is a black tuxedo cat, but these previously inflamed patches are ever darker/blacker than his fur, which is starting to grow back. They don't appear to be tender. What could be causing this? Is there reason to be concerned? Pet's info: Cat | Domestic Shorthair | Male | neutered | 2 years and 11 months old | 13 lbs

Amber Da Silva, DVM · Accepted Answer

Hello and thank you for using Petco Pet Education Center, formerly Petcoach. Hyperpigmentation is very common when there is chronic irritation in the skin, which happens with allergies. The hair can also change color as it grows back. I wouldn't be too concerned as long as the irritation is gone and that it is just pigment and not a raised growth. Monitor it closely and if you see it start to raise up rather than just be a flat, black spot on the skin, I would have it evaluated by your veterinarian.

My cat has dark skin patches from allergies. Should I be concerned?

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