The 53-page lawsuit alleges that the school failed to protect the victims of Dr. George Tyndall, who is accused of improperly photographing female students during exams and inappropriately touching them.
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"Today, we have amended our lawsuit to reflect that we are suing on behalf of 24 women who alleged that they were victims of Dr. Tyndall," Allred said at a press conference while two of those female students sat beside her.
The two victims also gave statements detailing Tyndall's behavior.
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RELATED: Former USC students sue over alleged sexual misconduct by ex-campus gynecologist
The U.S. Department of Education is investigating whether USC concealed sexual harassment allegations made against the doctor.
Tyndall retired last year and has denied any wrongdoing.