I've done some research on Candida, I've read that one symptom of an overgrowth of Candida, which is found naturally in the gut, mouth, and even skin, is skin rashes. I'm not sure how long these rashes last though. If you suspect having a Candida overgrowth, you might want to have your doctor take a stool sample. From what I have read, overgrowths of yeasts can lead to serious problems and has even been linked to some autoimmune diseases. One natural way to reduce Candida is to take probiotic supplements (friendly bacterial) and to eat garlic daily (preferably raw). Raw garlic has been proven to be a natural antibiotic.
Hope this helps.