Identification: Unknown pest/problem on Heuchera

I need help to identify some spots that have appeared on the backs of the leaves on a couple of my heuchera plants. They look almost like some kind of mold or spores, and the first plant itself is not looking very healthy. See photos. Can someone let me know what this is and possibly how to treat it?

Much appreciated!

 

The swellings on the under side of your plants reminds me of something called edema that has reciently come to my attention with regard to plants. It seems to be a swelling/almost a blister on the leaves of plants. It means the plant is collecting too much moisture within and these swellings are formed to try to get rid of the extra moisture. This whole thing could be way off base, but it is a thought. Check out this link.
http://www.ipm.iastate.edu/ipm/hortnews/2006/4-12/edema.html
Anyone out there. Let me know if this seems logical.

 

Looks like a fungal rust.