The boy's grandmother told police that a man who was visiting her Augusta house had performed a sex act on her grandson, according to a Richmond County Sheriff's Office report.
The grandmother said the alleged incident occured when her grandson went outside to ride in the mans truck.
When the boy returned, he told the grandmother the man had performed oral sex on him, according to the report.
The child told police the incident happened on the side of the home.
No other details were available as of Friday night.