The Department of Health asks people not to use the cosmetic cream Santen, as it may contain excessive mercury levels.
The department investigated after the Hospital Authority alerted it to a 28-year-old woman with mercury poisoning.
She had a swollen face and was admitted to Queen Mary Hospital on March 17. She had high levels of mercury in her blood.
A friend gave her the cream and she had used it for about a month. Tests showed the product had mercury levels at 15,211 times the acceptable standard.
The department urged people to stop using the product, and to consult health-care professionals if they feel unwell or are in doubt.
It also asked people not to buy or use cosmetic products of unknown composition or from doubtful sources.
