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It has been described on many occasions as an antiseptic. It has been known to fight against acne-causing bacteria, intestinal parasites and high blood pressure. Domestically, onion is used for bruises, colds and fevers. Onions can be cut up, rolled in a cloth and tied to the wrist and ankles to break a fever. Optionally, it can also be cut up and put under a sleeping mat before going to bed. This is used especially overnight to cure cold, flu or sinus infections.