How are your water parameters (amm/nitrite/nitrate)? Im not 100% sure of what exactly it is. So, my best advice would be to watch the bump & your fish. If your fish starts acting strangely (not eating, swimming differently, flashing, etc) or the bump starts to change for the worse (gets fuzzy, grows in size, looks bloody, etc), please let us know & we will figure out the best way to help him.