A three-year-old's fingertip had to be amputated after a sticking plaster which was left on for two weeks cut off the blood supply.
The toddler cut the tip of her index finger on glass, a report in the latest issue of the New Zealand Medical Journal said.
Her parents dressed the wound with Band-Aids, one placed length-wise, the other around the finger.
"After initially complaining of pain, she refused to have the dressing removed despite multiple attempts by her parents," plastic surgeon Marcus Bisson and registrar Jonathan Heather said in the report.
After two weeks, the parents took her to Hutt Hospital but the flesh at the fingertip had died.
The report's authors said they believed this was the first case of a Band-Aid-type plasters cutting bloodflow.
They said people without health care training might not be aware of the risk that the pressure of sticking plasters could restrict bloodflow.
A Band-Aid spokesman told the New Zealand Herald all packets warned that the dressings should be changed daily.
