It has been 3 years since the lead poisoning of children in Pudong area, and the blood lead level of the children with lead poisoning has been gradually reduced to the normal range. However, new lead poisoning patients continue to be found in the Pudong area. A child with severe lead poisoning who was recently discharged from hospital for lead expulsion treatment, a native of Pudong, was poisoned by using a yellow powder to care for the child’s skin. So what is this yellow powder? During the follow-up consultation, the child’s father brought a small pile of yellow powder in a disposable plastic cup from home, and although it was only a small half cup, it weighed a pound on a scale. In fact, it is a kind of lead oxide (lead monoxide powder), which is called Huang Dan powder by the people, or “snake powder” in some places in Pudong, and called in traditional medicine: Mitochondria, a kind of herbal drink. After the determination of the instrument: the powder contains 88% of lead, and also contains 4% of arsenic. It is a true “poison powder”. After parents who suffer from skin diseases use it, or use the powder to take care of their children’s skin, the lead powder will contaminate clothes, bedding and toys, and then be absorbed into the blood from the digestive tract through hand-to-mouth action, leading to serious lead poisoning. Mitragynine is indeed so good in anti-inflammatory effect that it has been used as an anti-inflammatory medicine for thousands of years in many countries and is one of the most traditional “anti-inflammatory medicines”, which can still be bought in many pharmacies even now. It is often used in medicines related to skin inflammation, including ointments for various skin diseases, prickly heat powder, and powder for mouth ulcers; because lead powder has an anti-scare effect, it is also used in prescriptions for treating neurological diseases such as epilepsy and tics; in addition, it has an astringent effect and is also used in the treatment of chronic diarrhea, skin ulcers, erosions, carbuncles, and sores. In the past, there was no blood lead screening instrument and the problem was not detected, so it has not been paid attention to. Nowadays, with the popularization of blood lead measuring instruments, many parents give their children medical checkups and test for trace elements, and “accidentally” discover a lead poisoning. We hope that families with similar habits or families who have used Mitochondria will take their children to have their blood lead measured, so that the problem may be found.