Hi Could be fungal infection. Share photographs of concerned area to see what exactly is the pathology and accordingly treatment can be advised

Treatment depends on the severity..Fungus or yeast infection....common around skin folds like thighs and genitals.. avoid sweating, sharing clothes,towels and soap.. specific medicine required depends on the severity.. for detailed prescription do direct online consultation by sending photos.

U could b suffering from a condition called Intertrigo. It is a rash that usually affects the folds of the skin, where the skin rubs together or where it is often moist. This rubbing can cause a breakdown in the top layers of the skin, causing inflammation and a rash. The breakdown of skin makes it easier for bacteria or fungus to develop in this area. Corroborate with pictures and consult a Dermatologist fort he same.