why my fish is turning black?????????

Hi
i got a golden fish
and i see that there is a black areas on the fish
i dont know why but its kinda creepy
is it healthy ,is she going to die
the thing is (i dont know if it was because of this but) my parents was changing her water
and she fell down the container couple of time and there was like several red dots on it
i dont know if those dots was from her dropping of the container
but they were gone and now black areas are over her back and her tail
is she gonna be alright
 
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