Has your son been treated for a yeast infection with a course of nystatin or diflucan? If he responds to this therapy, he may need several courses & lowering the sugar content of his diet to completely clear & supplementing with dairy free acidolpholus. Antibiotics can also bring on yeast infections. My son always had a red, itchy rectum when his flared up. Applied kinesiology can also identify yeast problems at times. Janice >His only detectable problem =