Pruitus ani is only a symptom rather than a disease. Most intertrigos are mild with only change in pigmentation.
I actually believe, after more searching that it is "pruritus ani" but I am unsure what the treatment is...
I would like to say I have scoured a lot of images on google and I don't think this is it the intertrigo images I've seen are much more red, splotchy, and aggressive looking. I've been applying lamisil and cortisone-10 once daily and I haven't seen much improvement. Could it be something else? Or are you certain with you first answer and I just need to try a different treatment?
Monilial(yeast) intertrigo.