Cowberry redleaf fungus on an azalia

Cowberry redleaf fungus on an azalia

Cowboy redhead fungus (Exobasidium vaccinii) growing on an azalia in a front garden. A few of the reddened leaves on the azalia can be seen in the backgrounds.

UPDATE: more likely to be the related fungus, an Alpine rose apple (Exobasidium rhododendri).