There are probably two things going on, the bumps are galls and the feeding damage is probably being done by grasshoppers. Grasshoppers take big bites. Neither the galls or the grasshopper feeding will harm your tree. It isn’t practical to try to treat either. Your tree needs an inch of water per week, test the soil and water if it is dry two inches below the surface. Mulching under the tree also helps. Grass is a big competitor for water. Assess your trees health in the morning before the day heats up and cause the leaves to wilt. Wilting is a natural response to heat.