When we get a cut on our body , our blood vessels and WBCs are there to heal it then why do we put on a bandage from outside ?

When we get a cut on our body , our blood vessels and WBCs are there t

1.	When we get a cut on our body , our blood vessels and WBCs are there to heal it then why do we put on a bandage from outside ?
Answer» When we get a cut on our body , our blood vessels and WBCs are there to heal it then why do we put on a bandage from outside ?