I really just want to share this with people. About 5 years ago, I was going out with this mexican, he injured his thumb. It had turned black. the next day he returned with an onion wrapped around his thumb. He said he had it on for about 5 hours. The next day the wound had almost disappeared. He said he took off the inner very thin pealing of the onion. Then wrapped Then took the thick piece and used that. Also my daughter her boyfriend is mexican. One day while he was in mexico, we were talking on the phone. I decided to ask him the question, If you get cut and it turns black would you use an onion, he said just a minute, he will ask his dad. After a minute, he said yes use an onion Iasked kind of an onion, he said any. And the same manner, take off the thin inner pealing.