The United Nations says it heard consistently about sexual violence from Rohingya women, including gang-rape of women by multiple soldiers.
UN Special Representative of the Secretary-General on Sexual Violence in Conflict Pramila Patten made the remarks on Sunday.
"One survivor was in captivity by the Myanmar armed forces for 45 days when she was raped repeatedly," she told a press conference in Dhaka.
Patten said others still bore visible scars, bruises and bite marks attesting to their sufferings.
"Any actor who commits and commands or condones sexual violence against civilians must be held to account," she said.
The UN special envoy visited Bangladesh to better understand the patterns and trends of the sexual violence related to the conflict in Myanmar.
The official will also convey the voices of Rohingya women and children to the Bangladesh authorities, the United Nations Security Council and the international community.
According to UNB, the Special Representative visited several field locations, including the Bangladesh-Myanmar border itself.
She will met relevant Bangladeshi authorities in Dhaka and Cox's Bazar to discuss about collaboration and coordination with the UN over concerns arising from the unprecedented influx of Rohingyas into Bangladesh.
The UN envoy will brief the UN Secretary General on the situation she observed on the ground after her return to New York,
Her office will compile the annual report of the Secretary General on conflict-related sexual violence to be presented to the Security Council next March which includes a dedicated section on Myanmar.