Great news for us tea drinkers: those used tea bags are a free first aid kit. Tannic acid, the stuff that makes tea brown and bitter tasting, is similar chemically to aspirin and other anti-inflammatories. Tannins also constrict blood vessels, slowing down blood flow to an open wound. Place a wet bag on bug bites and stings, sunburn, rashes, cuts, toothaches, and bruises to reduce pain and swelling. Slow bleeding by placing directly on a wound. Place wet bags on each closed eyelid to eliminate bloodshot or puffy eyes, or drip directly into eyes for infections and sties. Also aids healing of fever blisters. The cheaper the tea, the stronger the tannins, but the more it will stain your skin.