Thank you for your query. If its a simple friction burn then you don t need to worry much at the moment, as it will resolve spontaneously with time. I would like to suggest you use some soft, cotton, seamless underwear of the right size and fit. Wearing an underwear of wrong size is very common in our country among both the sexes. However, if it does not heal within a couple of weeks or if its sore or oozing, or if you are sexually active, I would suggest you consult a dermatologist to rule out any sexually transmitted infection or any form of dermatitis and adequate management for the same. Hope I ve been able to satisfy your query. Please don t hesitate to ask for any further clarifications. best of luck. Dr. Sourav.