Fungal infection or Ring worm.. when occurs in groin, called as jock itch.. Usually fungal infection is common in moist areas of body like skin folds..It's mostly circular or round in appearance.. May be red or black in colour.. Treatment depending on the type and severity.. Avoid sharing clothes, towels and soap; sweating also increases it..Do direct online consultation for detailed prescription

Hi.  Greetings. Its better that you actually see a qualified dermatologist near you for the same and get a detailed evaluation directly.  Some issues may not be tackled completely by online consultation.  Warm regards, Dr Govind Suresh Mittal, Therapeia skin hair and ENT centre, Bengaluru.