My senior cat has sores that won't heal, losing hair. Is it cancer?

Some appear to be infected. This may be from the stress of moving coupled with a new environment and allergens he is not used to. Since they are so wide spread it is best to have him checked for ringworm also. Your vet can prescribe antibiotics to help clear the infection and treat the underlying cause.

It sounds like Fatsy may be overgrooming due to stress and causing hair loss and sores. He also could have an allergy causing the symptoms you are describing. This does not sound like cancer. Usually with cancer the tumor is under the skin, feels like a hard irregular mass and is often attached to the underlying tissue. The medication should reduce the skin itch and inflammation and help the raw area heal. Make sure there are no fleas, and using a Feliway diffuser sometime help cats relax, reduces stress and the overgrooming. Thanks for using Petco Pet Education Center, formerly Petcoach to help you care for Fatsy.

This could be caused by a secondary bacterial infection, mites, fleas or an allergic reaction, it sounds quite severe, I wouldn't wait any longer, you need to take her to the vet in order to get it treated.

It's very hard to judge from a picture, it could be an infection but at her age a tumor would not be surprising. this sore needs to be checked and analysed as there are many conditions and types of tumors that could look like that. take Kitty to the vet, they will perform a fine needle aspiration on the growth and send it to the lab for analysis. when the result comes, the vet will advise what needs to be done according to the diagnosis.

Thanks for using Petco Pet Education Center, formerly Petcoach! While it is hard to tell just in these pictures, I think cancer is less likely and something more benign like allergies and dermatitis is more likely. Ultimately, this requires further investigation to know for sure. This is possibly due to allergies. It really comes down to figuring out what is causing her allergies so that they can be treated or the specific allergen avoided. A secondary infection is likely and also needs to be addressed. There are many things that can cause allergies though in most cases they can be broken down into 3 big categories: flea, food and environmental allergies. Allergies are usually worked up in a stepwise fashion starting with flea allergies as this is the easiest and cheapest to take care of. If not on a flea preventative, then it would be a good idea to get started on one. If already on one then it would be a good idea to change to something else (there are many new products out in the market). If not improved in 1-3 months then it is time to move on and check for food allergies by switching to a novel diet (new protein and new carbohydrate). If that does not seem to be the issue then you are left out having to check for environmental allergies which require blood and/or skin tests. Allergies can be very frustrating to deal with at first but so rewarding at the end when we are able to treat them effectively!

Sorry to see poor Carrie has been having these sores. It's less likely that these sores are due to an infection, and more likely that they are happening due to an autoimmune disease (self-attacking), or skin cancer. The only way to tell for sure is to have a skin biopsy done by a veterinarian and analyzed at a veterinary laboratory. I would also want to test Carrie for FIV, which is a disease that acts similarly to HIV in cats. I've seen lesions like this in FIV positive patients in the past. I recommend discontinuing the use of hydrogen peroxide. This antiseptic actually causes more harm to the tissue than it does the infection and is considered an outdated practice by medical practitioners. The best thing you can do for these wounds is flush them with normal tap water for five minutes twice a day. This will help keep the sores from getting infected and promote healing. It's best to schedule a vet appointment sometime soon, because these sores will keep occurring and will get worse over time if not properly treated. Sorry to give such scary news, but I hope this will at-least be helpful to get Carrie better.

These lesions can be caused by a few different things, including fleas, mange, lice, infections (bacterial or yeast), ringworm, allergies, among others. They can also be self-induced trauma from itching. If you can't catch her, it will be very difficult to treat. If you can catch her, you can try either a topical flea preventative or flea collar like Seresto, or a medicated shampoo that is anti-fungal and anti-bacterial like Dechra MalAcetic Ultra Shampoo. But I really think this needs to be seen by a vet as the yellow coloring may indicate bacterial infection and she may benefit from antibiotics.