Large Black spots on Azaleas
Large black spots on Azaleas with light green marshmallow looking things on azalea leaves. Some of the black spots are 1/2" wide and some of the "marshmallow-looking" things are an inch in diameter.
The marshmallowey things sound like azalea leaf gall. This article tells you about prevention and treatment: http://plantclinic.cornell.edu/factsheets/azaleagall.pdf
This article includes a section on leaf spots, and pictures of cercospora leaf spot, which may be your problem: http://www.clemson.edu/extension/hgic/pests/plant_pests/shrubs/hgic2050.html