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

Well itz less likely a fungal infection, Hope you have consulted a dermatologist.

This is not fungal infection. This is psoriasis. Please contact me using online consult option for proper examination diagnosis and treatment