Katrina Arredondo​ was a youth officer at the Melbourne Juvenile Justice Centre in Parkville in the 1990s, when she allegedly had sex with a boy detained at the centre, and after his release, between 1994 and 1995.

The boy was 15 at the time of the first alleged offence. She was 27.

Detective senior constable Sarah Kendall told Melbourne Magistrate's Court on Friday the boy told a Department of Human Services worker about the alleged abuse in 1996.

When he was interviewed, the boy told a department worker that he remembered Ms Arredondo having a small scar on her lower abdomen, just above her pubic area.

He thought the scar was from an appendix operation, however he added, "I'm not sure; I'm probably wrong."

The case was not pursued, but in January this year the man - now in his 30s - made another statement to police. This time, he said he had "just remembered" that Ms Arredondo also had a mark or perhaps a birthmark on one of her breasts. He was not sure which one.

She has since been charged with the sexual penetration of a minor, and with engaging in oral sex with a minor.

Police made an application to the magistrates court to have Ms Arredondo's breasts and lower abdomen photographed, to see whether she did in fact have identifying marks that corresponded with the recollections of the then-teenager.

Ms Arredondo, of Brunswick, had previously refused police requests to photograph her body, the court was told, although she had showed Detective Kendall her scar.

Her lawyer, Jacqueline Kennedy, told the court that Ms Arredondo had never had an appendix operation, and her small scar was from a laparoscopy - a procedure she had undergone as part of her IVF treatment five years after the sexual offences were alleged to have taken place.

Ms Kennedy said her client had medical records to back this up.

"Obviously this procedure which has been requested is invasive," she said.

Magistrate Johanna Metcalf granted permission for a forensic medical officer to photograph Ms Arredondo's lower abdomen and use the photograph for their investigation.

She refused a police request to photograph Ms Arredondo's breasts, saying the man's descriptions of a mark or birthmark were too vague to warrant submitting Ms Arredondo to being photographed.

"Any woman could have some sort of mark in that area, and it's a very imprecise description," she said.

"I'm not persuaded in relation to the request."

However, she said the description made by the man in 1996 of Ms Arredondo's scar was more "cogent", and said photographing the lower abdomen would be "less invasive" than photographing her breasts.

She ordered Ms Arredondo submit to being photographed within 14 days, and warned that "reasonable force" could be used to obtain the photograph.