D.B.
There are yeast strains that are resistant to treatment, just as there are bacterial strains that are resistant. In addition, a lot of these skin rashes look similar - heat rash, contact dermatitis, etc., plus you're dealing with a post-impetigo issue. Sometimes there are reactions to medications. Remembering that the skin is the largest organ, you might consider really working to reestablish a good balance and some healing from INSIDE, not just topical treatments. Yogurt with live cultures can help in many cases but it's often not enough. You want something safe for children, something unprocessed (or at least not chemically processed with additives or chemicals which can alter body chemistry - which is pretty much anything with a lot of ingredients on the label), something with no warning labels (e.g. nothing like typical vitamins that say to keep out of reach of children!). If you are interested in learning more about cellular nutrition, let me know. There is solid data in food science over the past 25 years (coming out of US research institutions) and also phenomenal new work being done in immune system boosting. I've been to many seminars and training sessions, and I can tell you, it's ground-breaking and well-supported. Sometimes a non-medical approach works best, or at least provides the best foundation for medical successes.