I've been having this debate with someone who is a bit of a germaphobe in my view.
Say I have a paper cut on my finger. It's deep enough to bleed initially, but it stops within a couple minutes. Maybe I need a bandaid at first, but after a day or 2, it is past the point where it starts bleeding again if I accidentally hit it or rub it on something. A couple days on, it still has the little flap of skin on it. Later, that goes away, but you can still see where it was. Finally, there is no trace. At what point in this process is the wound effectively closed?
When can you resume normal activities (dish washing, food prep, go in a pool/hot tub, have a dog lick your hand) and not worry about infection?
Wounds heal from the inside out. Once bleeding stops it means that it is effectively “closed” as the inside is no longer leaking out. The rest of that is just the layers of skin repairing itself from the bottom to the top.
So as others have said, when it stops bleeding is when it’s “closed”.
Normal activities for a paper cut? I'd you don't have a compromised immune system, Live your life once you're done bleeding. Exceptions for sticking your hand in raw sewage.