My cat's back lump popped with green pus. What should I do now?

It sounds like Diesel has a serious infection. I recommend to have him examined by the veterinarian. Antibiotics will clear this up significantly faster. He also needs to have a hair clipped short around the area and he needs to wear an Elizabethan collar at all times to protect it from scratching or for the trauma. Have him examined today. Best of luck.

This is an abscess and the white substance is puss. These are often caused by something under the skin that gets infected. It could be a thorn or from a bite. It's best if a vet examines this and explores the wound, because if the cause of the infection is not removed, then the infection will never clear. Sometimes these infections have potential to cause infections elsewhere, or can get worse, so a vet may need to prescribe medication to prevent this. For now, keep the area clean by flushing with water twice a day. I hope that helps and Mittens gets better soon.

Hi there and thanks for posting! If you cat has a lump or mass that has appeared to have ruptured, I would visit your veterinarian right away. The mass may need to be removed or treated with antibiotics. Your veterinarian may also take a sample of the mass to determine what it is and if it needs to be removed. I hope this helps and thanks for using Petco Pet Education Center, formerly Petcoach!

Thank for using Petco Pet Education Center, formerly Petcoach! It does sound like a small pustule with pus. If it was small and it is now drained and there is no inflammation present then it is probably fine to just keep an eye on her. If a discharge develops or it becomes warm to the touch or painful, have her evaluated by your veterinarian for further assessment and treatment as antibiotics are likely going to be needed. Good luck and have a good night!

That is very oddly discolored gunk for sure. I would certainly clip (if you're able) around the area to see if it looks infected or can be kept clean at home (clean washcloth, Elizabethan collar to prevent pawing at or licking it, keeping the area trimmed and dry). If Gremlin won't let you look at it or clean it properly, more discharge is coming from it, or it's very large/rapidly changing in size, a vet visit is a good idea. They can safely clip back any hair to make sure there aren't other pockets of infection, can clean the area, and may suggest taking samples if they suspect something more than a clogged pore or minor abscess.

Hello. Kipsico was bitten probably by another cat, developed an abscess & it has now blown open. If she will let you clean this with warm water & a skin antiseptic like Hibiclens ( available at any pharmacy ), she will be fine until you can have her seen by your vet tomorrow. She will need antibiotics & possibly need to wear a cone to keep her from licking the area, but these things usually heal quite nicely. Make sure you keep her up to date on all her vaccinations, especially leukemia, as this virus is spread through cat bites. Thanks for using Petco Pet Education Center, formerly Petcoach.

These each sound like an abscess that healed but trapped the bacteria under neath so it opened up and drained. The yellow inside may be fat or necrotic tissue. Clean it with soap and water on a cloth until you can take her to the vet. typically they heal very well and quickly but will need antibiotics to make sure the infection is gone while it is healing