BEIJING (AP) _ An unlicensed Chinese doctor has been arrested on charges that he fatally poisoned a 16-year-old girl with a homemade remedy for a skin disease, a news report said Monday.

Bai Mingsheng prescribed 32 homemade medicines in February for Zhang Jialing, who suffered from psoriasis, a skin disease, the official Xinhua News Agency said. It said both lived in Ulanqab, a city in the northern region of Inner Mongolia.

Zhang died March 24, and tests on her medication showed it contained hydragyrum, a toxic chemical, Xinhua said. It said Bai admitted that the medication was made with the chemical.

The report didn't say what penalty Bai might face if convicted.