I've recently gained weight and have always used powder between my legs. Sometimes at the end of the day the crevice between my legs and vagina itches (where my panties are). When I scratch it, normal reaction, it looks like I just scratched dirt off of my skin. Also, I have noticed that the area has gotten darker too. I wash 2 times a day and I never had this issue before I gained weight. Could it just be sweat? Or my underwear rubbing in the area? Should I stop using powder?