It happened on the second floor of the Macy's inside the Exton Square Mall in Exton, Pa. around 7:00 p.m. on Saturday.
According to investigators, a 12-year-old boy told his family he had to use the nearby men's restroom.
While in there, police say Jarjisian flashed his genitals at the boy.
"The boy noticed the adult male stand up, drop his pants, and basically, kneeled in the stall and exposed himself under the wall dividing the two stalls," Detective Scott Pezick of the West Whiteland Police Department said.
The child ran from the area and told his parents.
Jarjisian returned to the bathroom four times Saturday night, police say.
This is not the first time police have heard of incidents at this location.
"In 2003, we've received some information that men were going to that bathroom when it was a Strawbridge's store looking to engage in some elicit activity," Pezick said.
Six years ago, investigators set up a sting and arrested several men who allegedly went to the same bathroom to engage in sex.
Police are not sure if the suspect had the same intentions.
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