Hi,
I recently have been reading up on ear candling and just thought you may want to be wary of anyone who tells you that white powder in the cone is yeast. I read on the wallys ear candle website that it is rare that anything actually gets siphoned out of the ear canal. the purpose of ear candling is to soften compacted wax in the ear canal so that it will come out on its own for up to five days after. wax found inside the cone is usually from the ear candle itself and white powder means that there wasn't a good seal between the cone and the ear. I'd find someone else to help you next time.
good luck.

http://www.wallysnatural.com/faq.html