Weird scab in nessarius snail

coolbreeze

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Hi there - I’ve had this snail for about 2 weeks and just noticed this scab/lesion looking thing on his back (not the shell). Any idea what this is or if it’s a sign of something bad for my other fish?

DE626F58-C939-4ADC-8C18-C8915AD9A8A9.jpeg
 

FernBluffReef

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Not a scab. Normal. When snail retracts it’s it’s cover

Called a operculum
 
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