The biggest and most obvious difference between band-aids and band-aids is that band-aids are breathable while band-aids are not. The purpose of band-aids is to protect the wound for a short period of time, to prevent secondary damage, and to prevent bacteria and foreign objects from contacting the wound and causing infection. Therefore, band-aids do not contain drugs, while Band-Aids contain drugs, which also have a certain role in promoting wound healing. Band-Aids are a common topical medication for minor injuries in daily life, and also have a protective effect on the wound and a hemostatic effect. But only for a short period of time to protect the wound, can not be used for a long time, band-aids and band-aids can only be used when the wound wound is not very large.