I believe that to be true about the sun. I am in a four season area and last summer when I was getting plenty of sun, I felt great. Fall came around and flare ups galore. I am doing great now and can't wait to add in some sun to my regimen. :)
Also, for the yeast on skin. I have a few areas of tinea (discoloration) on my body that I have been using neem soap on for about 4 months. It is almost completely gone. I get it from bytheplanet.com. Here is a link to the kind I use: http://www.bytheplanet.com/Neem/Catalog/Neem/Soap/organixorange.htm It smells great too!