An Upper East Side plastic surgeon forced a staffer to work throughout her COVID-19 illness — and even asked her to fudge her test results so she could return to the office sooner, she alleges in a new lawsuit.

Christina Flores, 33, claims Dr. Ryan Nenistein — a board-certified plastic surgeon with more than 40,000 followers on Instagram — didn’t care about her health after she tested positive in December 2020, instructing her to work from home even as her symptoms worsened, according to the filing in Manhattan Supreme Court.

“Every day was constant calls, texts, emails,” she told The Post. “He was relentless and the more I tried to work through it, it just wasn’t good enough for him.”

The doctor continued to put pressure on Flores, and ultimately allegedly asked her to “immediately use a nasal rinse and virus-killing nose swabs in order to generate a false-negative Covid test that would illegitimately justify her returning to the office,” the suit charges.

When she eventually came back to the office, located inside Bergdorf Goodman, she felt she became Neinstein’s “target.”

“He gets away with it,” Flores said. “He’s a plastic surgeon in Manhattan. He feels he has money and power.”