Could be dry skin. If you shave it could be razor bumps. At worse it could be crabs.
What Causes Itchy Groin Area ?
Probably dry skin, heat rash, crabs, or chaffing. Hopefully, it is not anything as serious as crabs.
Because its a moist, warm area you can get a fungal infection in the groin its called 'jockstrap itch'. Women can get it under their breasts, especially in the hot weather and if the breast is large.