Black spot on fiddlers leg

What could it be?

Sorry, couldnt get better pic
(Its on the leg in the left side of the pic)
image

 

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What are your parameters?
And does she have access to dry land?

 

Good & yes

 

It is just a bruise. It should be gone once it moults. Btw,fiddlers are need brackish water.

 

how is your crab?

 

Good, sane behavior, despite the spot she was doing well, i was just curious as to what i could be from

 

Good to know. Don't worry, it is most likely a bruise and should be gone when it moults.