(Hood River, OR) -- The public's help is being sought in the search for a 15-year-old boy who has a serious brain condition. Benjamin Nuissl [[ NOOS-ul ]] vanished Monday during a family bike ride in Hood River. Benjamin's family tells KOIN-TV he has a condition that gives him a tendency to wander and sometimes get himself in trouble. Benjamin Nuissl has a scar on the right side of his head. He's about six-foot, with blondish-brown hair. He has been spotted in downtown Hood River near the Salmo Street Springs and the Gateway Shopping Plaza.