What is healing by secondary intention?

So, healing by secondary intention is when a wound is left open to heal from the inside out. This is often done in cases where there is significant infection or pus within the wound. This allows the infection or pus to come out. The wound will then heal from the inside out. This often leaves a wider, more obvious scar than when there is healing by primary intention where the wound is closed. It's generally recommended that in a heavily infected wound or wound where there's pus that the wound shouldn't be closed at the time of the original surgery. you