Certified GKH Gardening Expert
It sounds like it may be azalea lace bug. These articles will help: https://utextension.tennessee.edu/publications/Documents/SP290-E.pdf, https://www.gardeningknowhow.com/ornamental/shrubs/azalea/azalea-lace-bug.htm If there are no signs of lace bug, then it could also be azalea gall. This disease commonly occurs in early spring on new leaf growth. The leaves become curled, fleshy, and pale green to white. Affected leaves eventually turn brown and should be removed and destroyed. However, it is most likely attributed to lace bugs, as they generally cause bleaching (pale green) of the leaves.