What do the bumps look like, how big are they and what color are they? Are they on the top-side or under-side of the leaves? Do you see any signs of an insect infestation?
There are a few possibilities. It could be eugenia psyllid.
or it could be a leaf gall:
I would need more information or a photograph for a more positive identification.
For more information on the care of eugenia plants, please visit the following link: