My cat has a bald spot on body

I have a 13 yr old tabby she recently started licking herself and now has raw area.
Could it be that for the last week or so she's been eating tuna. Is this an allergic reaction and what can be put on infected area?.
.Thank you
Lori Wolff (very concerned)

Welcome to The Cat Site; sorry it's under these conditions.
Many cats are allergic to fish, so it certainly possible. I would discontinue immediately feeding all fish and fish based products. If a simple food allergy, should clear up pretty quickly. Note that you need to read the labels carefully; sometimes 'beef' flavored food actually has fish in it.
The problem with putting any topical solution on the fur is, your cat will lick it off, so you need to check with your vet to make sure it's okay for cats.
On the other hand, she is 13 years old. When is the last time she had a checkup.
Here is an article about skin problems that might give you other ideas as to why your cat is suddenly licking herself raw.

Thank you for your quick response.
I'm going to not feed my cat any fishes especially tuna.
Today she's resting comfortable not scratching herself.

Lori Wolff

I think your best bet is a vet visit. Have you noticed any weight loss, increased appetite or increased drinking? My older cat started licking and pulling hair off her belly and inner legs and she ended up having hyperthyroidism. Your kitty probably just has allergies but it's better to be cautious with the older cats.

Thank you for your response. My cat has been drinking more but she's not biting her fur off. I really can't take to vet I can't afford it. Instead I stopped giving her tuna she seems more relaxed.

Lori Wolff