Many people tend to apply a plaster in the acute phase of the injury only, that is, just until the bleeding has stopped. Then the plaster is removed and discarded as quickly as possible in order "to let the wound breathe".
Scientific studies have shown, however, that in most cases wound healing will proceed better and without complications if the wound is protected with a plaster until they have healed off completely. There is even a new generation of plasters, such as Hansaplast Fast Healing, which will enable optimal healing conditions for your wound whilst protecting it from harmful external influences.
These special plasters can and should be left on the wound for two days or longer, so as not to interfere with the ongoing healing process and leave the wound intact. If you use a conventional plaster, however, it is recommend to change it every day or to renew it after it has gotten wet, for reasons of hygiene.