The pale, swollen, curled leaf portions are due to a fungal infection called Exobasidium Gall. They are not serious and don't cause long-term damage to the plant, so no treatment other than physically removing them is needed. If the shrubs are not already being irrigated during this drought, it might reduce their overall environmental stress to be watered periodically based on monitoring the soil moisture levels. We suggest removing the galls first in that case so that any spores they are producing aren't spread further by the splashing water (if you use a sprinkler or hose to water instead of just wetting the soil surface, which is preferable).

Miri