She was known as “The Duchess,’’ someone who could perform cosmetic magic on a massage table using a syringe and silicone. For more than a decade, her name was whispered in South Florida’s transgender community, having performed perhaps hundreds of procedures that transformed men’s breasts into double Ds or dainty derrieres into curvy wonders.

Authorities now say “The Duchess,’’ a transgender woman whose real name is Oneal Ron Morris, may have practiced her black market plastic surgery not just in South Florida, but across the country.

Twenty to 30 people from as far away as Indiana have come forward, saying they were victims of Morris’ elusive scam, according to Miami Gardens police Detective Michael Dillon.

So far, Morris and an accomplice, Corey Eubanks, face felony charges in connection with just two South Florida cases where women nearly died from her injections, which were actually a toxic brew of substances found in the tire repair product “Fix-a-Flat.”

Morris “made me into a monster,’’ said Rajee Narinesingh, who received several procedures from “The Duchess” in 2005 and came forward after Morris’ recent arrest. Narinesingh, a transgender woman who lives in Hollywood, said Morris assured her she had performed hundreds of successful procedures, most of them using what she called “medical silicone.” Narinesingh was delighted after the first set of injections, which made her appear more feminine. She paid for additional injections into her face, breasts, buttocks and hips.

Narinesingh, who was born a man but has always felt more like a woman, said friends who underwent similar procedures recommended The Duchess when Narinesingh wanted to feminize some of her features.

“There was a sisterhood of trust. She was part of the transgender community herself,’’ Narinesingh explained of Morris, 31, who also had her own buttocks beefed up with injections.

“There was a feeling that she won’t do anything bad, she knows what she is doing.’’

But almost a year after undergoing treatments, costing from $700 to $1,000 per procedure, Narinesingh began to suffer serious side-effects. Her face became swollen and disfigured with large nodules that grew to the point they burst. She was ill but was afraid go to a doctor. Finally, a friend recommended a licensed cosmetic surgeon who was willing to help her at no cost.

The surgery on her face was supposed to take an hour. It instead took four.

“The doctor pulled pieces of cement out of the side of my face,’’ said Narinesingh, a 5-foot-11, brown-haired woman, bullied since she was a child for being different from the other kids at her school in Philadelphia where she grew up.

Narinesingh, a public speaker on transgender issues, said she felt compelled to go public with her story in hopes of helping others avoid what she went through.

She said transgender people tend to use alternative treatments because they feel discriminated against or even abused by mainstream doctors. Once, when she was having heart pains, she panicked — not because she feared she was having a heart attack, but because she was going to have to go to a hospital.

“When you live this life sometimes you feel very alone,’’ Narinesingh said. Several years ago, she said she was brutally beaten by a group of thugs in Miami who taunted her for being transgender. She never reported it to authorities because she was afraid police would victimize her again.