Crocea injury?

Today I looked at my crocea and noticed a pinch in the mantle I examined the underside and there is a small circular patch of tissue that looks as if it has been eroded.It is darker than the surrounding tissue,and no other parts of the mantle or any other clams are effected.The clam is very responsive to shadows and mantle extension evrywhere else is great.There is no mucus or slime.
 
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