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This could just be a benign tumour (not cancerous) or a cyst, which are usually harmless providing they don't obstruct the hamster's usual behavior or organs. However, it could be cancerous, and hamsters are small enough for the cancer to spread quickly and viciously. Vets could remove the lump, but hamsters are tiny and the anesthetic could kill them just as easily as the lump itself.

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16y ago

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