If your hand is cut by the tinfoil in the powdered milk can and bleeds, it is because the edge of the tinfoil is sharp, resulting in a cut on the finger, which should be treated promptly to avoid infection. The edge of the tinfoil in the milk powder can is sharp, and the contact area with the hand is very small, so when touched, it will produce a large pressure on the hand in a small area, so it will cut the finger. In addition, the harder paper will often turn into a sharp edge and cut your fingers. If the finger is scratched in time to deal with, can flow of water to rinse the injured bleeding parts, followed by the use of iodophor or alcohol to disinfect the site, bearing in mind that the injured parts can not be in contact with rusty objects, in order to prevent the infection of tetanus, disinfection should be used in a timely manner after the band-aid. If the wound is deeper, go to the hospital in time. The hand was cut by the tinfoil in the powdered milk cans bleeding should be timely medical treatment, receive treatment.