Thanks for writing to us.
You seem to be having frictional intetrigo.
It occurs due to friction and trapped sweat in affected area. It is more common if person is overweight
, if tight fitting thick clothes like denims are worn and in humid climates.
To treat the area
after bathing wear the clothes only when the area is completely area
wear loose cotton underclothes
Avoid wearing denims or tight fitting trousers.
Dust the area with antifungal powder twice in a day, this will absorb sweat, prevent fungus from growing and also prevent friction to some extent.
develops apply a mild steroid
cream and ventilate the area till it dries.
HOpe that helped