Flies wouldn't be the CAUSE of your Candida. But, the yeast overgrowth on your skin can indeed attract flies. Flies are attracted to those type of smells. Try using antifungal shampoo and soap. I use Nizoral antifungal shampoo (best) and a tea tree oil bar by Desert Essence on my skin. Jason Dandruff Relief shampoo is a good alternative if you want less chemicals than Nizoral.