When using band-aids, it is always convenient to put things on casually. This is not correct.
Correct method: Before using the band-aid, first check whether there is any dirt left in the wound. If there is any dirt, clean the wound with sterile saline first, and then apply the band-aid. If the wound is pierced by iron nails and other objects and is relatively deep, you should go to the hospital for treatment immediately and need to be injected with tetanus antitoxin. Secondly, after opening the bandage, avoid contaminating the surface of the medicine. When applying, the surface of the medicine must be aligned with the wound, and pressure should be applied to both sides of the wound after it is applied.