CDC officials have diagnosed five cases of the mystery genital infection so far, but fear more are in the community. They were diagnosed among gay or bisexual men.
The fungal infection, also known as ringworm elsewhere on the body, "can spread through sexual contact and cause lesions on the genitals," the CDC said.
It's more commonly known as jock itch (when it affects the groin area) or athlete's foot, and can produce a round, itchy ... The rash appeared "on the [patients'] face, buttocks or genitals ...