Basically the dark spot in the clear part of the fish, will find a better photocant see any bump, can you tell us where to look or circle the area?
Sticks out on one side, as long as it doesn’t effect the others I don’t mind but would be good to find a remedy for the fishDoes the bump stick out form the body or is it smooth and just a dark circle?
If it sticks out then it's an issue. If it's smooth then it could be just colouration.