Hi,
The bumpy rash could be due to the same fungus which caused the athletes foot.Tinea cruris is the scientific name for fungal infection of the groin region.
it causes itching or a burning sensation in the groin area, thigh skin folds, or anus. It may involve the inner thighs and genital areas, as well as extending back to the perineum and perianal areas.Affected areas may appear red, tan, or brown, with flaking, peeling, or cracking skin.