Onions and dial soap for a wound that is infected. You make a paste out of the two together it works, even if you have a red streak just leave it on overnight and the next day infection will be gone, I promise.
If you have a cut, putting a piece of onion skin, the transparent film, onto it will stop it from bleeding immediately. I got this tip from a magazine and tried it when I cut myself chopping vegetables. The onion instantly stopped the bleeding. The cut was no longer than 1 inch, and not seriously deep, just enough to gross one out.