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Why does my box turtle have lumps on her shell? What should I do?

Updated on September 23rd, 2025

Pet's info: Other | Other Pet - Not Listed | Female | 1.3 lbs

Why my box turtle get lumps on her carapace? It’s hard to tell from the pictures. One is right on her middle top and another one is on the middle bottom back.

1 Answer

Most Helpful Answer

Emi Knafo, DVM, DACZM

Answered By Emi Knafo, DVM, DACZM

Veterinarian, Board-Certified Zoological Medicine Specialist

Published on May 12th, 2019

Hi, you’re right, the lumps are difficult to see in the photos. Lumps on or in a turtle shell can be from a number of things. There can be an underlying metabolic issue like metabolic bone disease (lack of UVB light and imbalance of calcium/phosphorus), or pyramiding, which can be from high protein and low humidity. Infections (bacteria, fungus, some parasites) can also cause shell lumps. Because these issues are all so different, it’s important to have Cookie examined by a veterinarian so they can do some tests and get her on the best treatment, if indicated. Good luck!
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