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My cat has a soft, bleeding lump on her side. Could it be cancer?

Updated On September 23rd, 2025

Pet's info: Cat | Maine Coon | Female | 9 lbs

I just took ownership of 3 cats. They were left on a friends property several years ago. One female, a Maine Coon, 5+ yrs old has a soft lump on her side the size of a golfball. Im told she has had it for years. It doesnt appear to bother her. The area bleeds a little, looks like from her skin stretching.. Her hair is starting to mat around the lump too. She eats, sleeps and plays normally. Could the lump be cancer? My friend said she was told it was a heartworm, which i dont believe

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1 Answer

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Answered By Andrea M. Brodie, DVM

Veterinarian

Published on July 23rd, 2018

This is likely a mass and it should be examined by a veterinarian. Since it is apparently growing and bleeding because the skin is overstretching, it should also be removed surgically, whether it is benign or malignant. this should happen very soon, as the wound will be prone to bacterial infection. This is not heartworm. Please make an appointment with your veterinarian. She is a beautiful cat!

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