Hi.. It looks like fungal infection in the groin that can be Jock itch.. Excessive sweating, wearing tight and non airy fabrics, obesity, improper hygiene , very hot and humid climate can be a cause.. You can do following home remedies and see if it improves.. I would suggest you to wash the area with warm water and mild soap and pat dry.. Apply a combination of antifungal and steroid ointment.. Avoid using any harsh chemical containing detergents and also avoid using any bleaches and fabric softeners.. You should wear loose fitting and cotton undergarments.. You can apply a coat of zinc oxide ointment over the area as it will have a soothing and sedative effect.. Make a solution of one part of vinegar and three parts of water and soak a wash cloth in it and place over the infected area.. In case if it still does not resolve consult an Emergency room or a skin specialist and get evaluated. Hope I have answered your query. Let me know if I can assist you further. Regards, Dr. Honey Arora, Dentist