Hello! I posted this remedy on a different site specifically about intertrigo, but I find your site very useful so I wanted to share this info here as well. I successfully solved my 7 years problem with intertrigo using kefir. My serious problem zones were always my armpits and "legpits" as I call them: inner upper thighs, *impossible* to keep dry -- as an expat living in tropical West Africa I sweat a lot on a daily basis. I tried several things before this, and I would like to report back on what helped. Topical coconut oil with turmeric powder was temporarily effective but stained clothing like crazy. Gentian violet was also temporarily effective, and also stained clothing like crazy.
I then found out about probiotics about 3 months ago, got some kefir grains 2 months ago, and a month ago it occurred to me, why not try them topically? So I did! The kefir did the job inside of a week, more like three days. My armpits look normal again. My "legpits" are no longer red-rash-looking, no itching, nothing. All I did was take a tablespoon or less (per application site) of the kefir grains mixed with the yogurt-like kefiran, smeared it on and left it on overnight, washed it off in the morning. I think what it does is crowd out the bad bacteria/yeasts with a diverse population of body-friendly bacterias and yeasts. I like drinking kefir, but this use is awesome and saved me from trying antibiotics again. So I wanted to share my success, and I hope this helps someone else solve their problem too. I should specify I used milk kefir grains, but I am guessing water kefir grains might work also.