My cat has a lip sore and bad breath. Is it dangerous or contagious?

I am very sorry that Kitty has his sore near her lip. Thank you for proving pictures, it is difficult to know precisely what caused this lesion it may have been a cat scratch, a traumatic puncture from for example a fence, or possible a primary skin like feline acne, or allergic disease. At this stage it appears to be slightly crusted and inflamed and I would suggest a trip to the veterinarian. The vet will most likely clean the wound and debris any necrotic material. The vet may also send home pain relief, anti inflammatory medications and / or antibiotics. The vet will also be able examine the area and reach a diagnosis. Best of luck to you both and thank you for using Petco Pet Education Center, formerly Petcoach.

Hi there and thank you for using Petco Pet Education Center, formerly Petcoach to address your concern. From the blurry picture, it is tough to say for sure what this is but it looks as though there is a ulcerated sore on the upper right lip. This looks as though it could be consistent with an indolent ulcer, which is part of a disease known as Eosinophilic Granuloma Complex (EGC). The cause of EGC is typically unknown but treatment is generally steroid therapy (topical and systemic). Generally, an antibiotic and anti-inflammatory are used to treat these. Also, if Leo is drinking / eating out of plastic bowls, switch to metal or ceramic to see if this helps. Many times, these lesions pop up for no known reason and go away after treatment. These lesions may not show up for months to years later once initially resolved. If this sore is not improving, I would have a veterinarian take a look at it so that the most appropriate diagnostic and treatment recommendations can be made. I hope this helps!

Thanks for using Petco Pet Education Center, formerly Petcoach! This looks like it is due to the tooth causing pressure on the gum causing this ulcer/lesion. I would agree with your veterinarian in that they probably need to sedate or put under anesthesia to be able to better evaluate this region. Then they can treat it accordingly. If it is found to be dental disease, they can correct it then. Best of luck!

This appears to be what is commonly referred to as a 'rodent ulcer'. The most common cause for these to pop up in cats is an allergy, typically to something in the food. Sometimes these will resolve in their own, however sometimes they can become infected, long lasting, and problematic. If they become very large and painful it can discourage the cat from wanting to eat. If this ulcer has been present for more than 2 weeks it is probably not going to go away on its own. At that time I would recommend taking you cat to the vet for treatment. Nathaniel may need antibiotics and an immunsuppresive drug like steroids or Atopica. If the lesions keep coming back he may need to be on an immunosuppressive long term and/or a hypoallergenic diet. I hope this helps. Thanks for using Petco Pet Education Center, formerly Petcoach. Best of luck.

It is difficult to tell form the picture alone what is going on with your cat's lips unfortunately. It almost looks like she/he has a sore or even infection in her/his whiskers and commissure of the mouth. I would recommend you take your cat to your vet for an exam. She/he may need antibiotics to resolve this and possibly pain medication is she/he is is uncomfortable. I would also be concerned there may be sores in the mouth that need to be addressed if you are seeing them along the outside. It is possible your cat licked something toxic or caustic causing these problems. I would look around your home to see if there is anything she/he could have gotten in to. I hope your cat improves quickly!

Thank you for using Petco Pet Education Center, formerly Petcoach! It sounds like Nero has severe gingivitis. This condition can be caused by a condition that causes the tooth roots to be resorbed by the body, or a build up of bacteria and tartar around the gum line. This results in chronic infections an inflammation, which can be very painful and even result in Nero not wanting to eat. I recommend having Nero looked at by a vet as soon as possible to determine the cause of this condition and begin the appropriate treatment. He may need to have some of the teeth removed under general anesthesia. I hope this helps and that Nero gets better soon!

Hi there and thank you for using pet coach to address your concern. From the pictures you provided, Popcorn's teeth on that side do not look that diseased. There may be an infected tooth somewhere in the mouth that is causing the odor. I would recommend having a veterinarian examine him so that the most appropriate diagnostic and treatment recommendations can be made. He may be in need of a dental cleaning under anesthesia to help determine what the cause of the bad breath could be. There may just be bacteria in the mouth, not necessarily an infection. I hope this helps guide you in the right direction. Please let me know if you have any other questions or concerns and I would be more than happy to help you further.