Boxwood leafminer is deemed the nastiest pest for this evergreen fixture of the Southern landscape. The leafminer is really the larva of an itsy bitsy fly feeding inside leaves through summer and early fall. After spending winter in leaves as pupae, adults emerge next summer. At first you don't see damage, but yellow pucker spots on leaves are a sign. Remove infested leaves.
Pesticides are available.
Camellia leaf gall is what those fat, whitish, deformed-looking things are. They're more common on sasanqua and should be showing up. When galls rupture, a whitish mass of fungus spores erupts to be carried on the breeze. These same galls will turn hard and brown. Pick and destroy affected leaves before the lower surface breaks, freeing those spores to build new lives.