I can see the yellow spots on your azalea leaves but the shot is too far away to tell much about it. Since all the spots look yellow, not brown, it appears that this damage has happened recently which argues against fungal problems. A fungus would show up a little at a time, and some of the spots would be brown while others would be yellow turning to brown. So this might be damage caused by something hitting the plant’s leaves such as a cleaning product, herbicide, liquid fertilizer etc. If you clip off the worst of the leaves it will be easier to monitor if whatever caused the damage has come and gone.
These spots are too large to be lace-bug damage, which is the most common insect that feeds on azaleas. If the damage continues by all means send us another photo or two of a closeup of two or three leaves. Look to see if there is anything on the underside of these leaves and should you see anything like an insect send us a photo. Be sure that when this plant is watered that no hot water spray from a sun-heated hose hits the foliage before the water runs cold again.
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