I have used calendula infused olive oil for a long time by itself and combined with other natural ingredients in balms, as it has tested abilities to fight bacteria and fungi. Good for quick relief as an emollient as well. However, my condition remains unabated.
I think the Brazilian researchers may have had the best intentions to do thorough research for a cure that could help a lot of people, but were probably under pressure to doctor the pictures to make their case report stronger. Whoever they had good results with, we know nothing about the duration of his condition, nor how long after the two weeks they determined that he was symptom free. The fact that they didn't publish more results after emailing David about their other patients' success leads me to believe they didn't have a strong enough case.
But all that said, everyone is different, and what doesn't work for chronic cases like me, David, sirpries, may work for people with acute cases that have minor secondary infections.