A freshman gymnast at the University of Michigan has become the first male to publicly accuse Larry Nassar, a former USA Gymnastics doctor convicted of sexual assault, of sexual abuse.

Jacob Moore, 18, held a press conference Monday and detailed allegations against Nassar. Last week, Moore joined a federal lawsuit against Nassar, USA Gymnastics and one of Nassar's other former employers, Michigan State University.

Moore’s sister, a former Junior US National Team member, also alleged that Moore abused her. She first published her account in a video online last year.

“I was inspired by my sister and everyone else in this community to kind of come out and help bring change to what allowed this to happen,” said Moore. “I hope to God no one else is or has been affected by this that hasn't come out yet, but if they are out there then I don’t want them to be scared to come out because of this stigma that guys can't be sexually abused or taken advantage of.”

Moore described how he went to see Nassar, a family friend, for treatment for his shoulder when he was 16. Moore alleged that instead of working on his shoulder, Nassar performed acupuncture near his groin. Moore then alleged that Nassar asked a female patient in the area if she had ever seen male genitalia, exposing Moore to the other minor. The amended complaint in which Moore joined the lawsuit states that there is no known medical connection between shoulders and groins. 

“I hope he rots in hell,” Moore said in an interview with the  “NBC News’ Megyn Kelly TODAY Tuesday morning.

Moore was a member of the U.S. men's junior national gymnastics team between 2015 and 2017.

Nassar served as the team doctor for USA Gymnastics, the oversight body for gymnastics in the U.S. and facilitator of the U.S. Olympic team for 20 years. He went to four Olympics as a team doctor. Nassar was convicted of various crimes last year including seven counts of first-degree criminal sexual conduct with minors under the age of sixteen and possession of child pornography. Nassar has been sentenced to 60 years in federal prison and between 40 and 175 years in Michigan state prison.

More than 200 women have come out with allegations against Nassar including some of America’s most well-known gymnasts, many of whom were allowed to give victim impact statement’s during Nassar’s sentencing. Moore’s sister, Kamerin, testified about the abuse she and her brother allegedly faced in January.

“My whole family was fooled by you, but I know now who you really are—a child molester and a master manipulator,” said Kamerin Moore to Nassar in a court statement. “You will never mean anything to anyone for the rest of your entire life. Never.”