My cat has a big, fluid-filled lump under her skin. What is it?

Question

Hello, my cat has big fluid (water) filled lump beneath her skin, located at under her right arm, I have a picture. I need help please. Thank you.

Dr. Davis · Accepted Answer

This sounds like an area of infection which is common in cats. The abscess can be caused by a bite or scratch. I recommend checking the area for a scab and clean the area trying to remove the scab. Then the pussy fluid will drain out and the area will start to heal. Abscesses can be painful and hot to the touch. If this isn’t hot or painful then you cat may have an injury causing the fluid filled area. I do recommend a veterinary exam and treatment as this sounds abnormal but if she’s fine otherwise, not painful and eating and drinking then you can monitor this. If its getting smaller then I’m not overly concerned but if it’s not improving then it’s time to get it checked out. Thanks for using Petco Pet Education Center, formerly Petcoach to help you care for your cat.

My cat has a big, fluid-filled lump under her skin. What is it?

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