Why is my cat's lip swollen and bald? Is it an allergy or bug bite?

From the photos it looks like Xena has a "rodent ulcer" (aka: eosinophilic granuloma complex). It is best to have her checked out by your regular veterinarian to get a definitive diagnosis and treatment. ( https://veterinarypartner.vin.com/default.aspx?pid=19239&id=4951528 ) Hope this helps. Best wishes.

Looks like a condition called esosinophilic granuloma complex which can occur in cats. It appears like it should be very painful. If you notice he is eating or grooming less, these are signs he is uncomfortable. Sometimes this is caused by an allergy. I would recommend changing food bowls and try a hypoallergenic diet. Ultimately seeing your veterinarian to have a biopsy performed to confirm the diagnose and starting some medications will be needed to help resolve the swelling. Good luck !

Yes, a contact allergy to food or bowls is quite likely, but an allergy to bedding, cleaning products or air freshener could also be possible. I would change her diet to royal canin hypoallergenic which is hydrolyzed in order to avoid sensitivities and change all bowls to stainless steel and rinse them thoroughly daily with warm water

I am sorry to hear that! I do think going to the vet would be a good idea. Cats can get many types of lumps at their mouths. From your description one thing I would want to rule out is eosinophilic plaques. These can be caused by allergies so getting on a low allergen food (I would recommend prescription due to cross-contamination at the manufacturing level) and medications can be vital! Of course it is hard to tell without looking at her so your vet may want to rule tests or take a biopsy first! I hope this helps!

She could have an eosinophilic granuloma which is common in cats and can be caused by an allergic response. The lesion may become ulcerated and is typically treated with a corticosteroid. If she has any fleas then she should be treated for fleas. You could also put her on a hypoallergenic diet and see if that helps. Try to find a low cost clinic or a vet that would take a payment plan so you can get her treated. If she just needs a corticosteroid then it shouldn't be very expensive. Hope she gets better soon!

It could be an allergic reaction or result of trauma (for example if Otto bumped into something). Allergic reactions could be tn anything Otto is in frequent contact with. Allergic swelling on the chin could be caused by an allergy to food bowls, floors, chemicals that you use to clean floors and carpets. If the chin is not swollen, not painful and not bothering Otto at all, I would leave it for 1-2 days. You could give him half of a tablet of human Piriton to help the swelling to go down. However, if the chin is bothering Otto or if he is trying to scratch it, you should take him to your local vet for a check-up

Poor baby. Looks like a pouty lip..lol. it is swollen, has a secondary inf3ction, and an ulcer. These can be caused by a primary infection, contact irritation, insect bite, or an immune mediated condition. Make sure his bowls aren't plastic, and call your veterinarian in the am to schedule an appointment to get it checked out.