CHIN BUMPS- this appears as a white bump on the piranhas chin and is very very common with new piranhas. it is from either new or stressed piranhas rubbing their chins against the glass too much. these will be gone a month after the piranhas stop rubbing against the walls.

FLESH WOUNDS- for all flesh wounds, the piranha should be put in a seperate tank or you should divide the tank off. next you should add a tbs of salt for every five gallons to make healing faster and relieve stress, and add melafix daily untill the wound is healed to prevent against bacterial infections. flesh wounds can take from less than a month to heal to many months. if the piranha is in severe condition and will never live a normal life again, and has been eaten from the tail down to the bone and 1/3 of it gone, you would be better off just euthenizing the fish. to do this, put it in a container of water and put it in the freezer. it is a painless way of death. what i did when one of my piranhas got murdered, i boiled it in water to get the jaws out as a memory. but its your choice.