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)

 

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.