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The two most common growths on a hermit crab are a molt sack, which is a dark looking spot on the side of a crab where they store nutritious goo aimed at helping them survive their molt.

the other one is a gel limb. When the hermit crab loses a leg or claw, they often grow a small translucent nub called a gel limb where the repacement will be.

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16y ago

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