The common plantain (Plantago major) has nothing to do with the banana-like fruit at the grocery store (other than the same name). Plantain is one of the most common lawn weeds throughout the Northern Hemisphere, often sprayed with weed killer, because it's considered a nuisance. But this is a shame, as it provides an excellent source plant medicine. It's most effective use is counteracting bee stings. Just crush the leaf into a paste and apply directly to burning stings and bites from insects and arthropods. Relief will follow shortly. This crushed leaf poultice can also be used on cuts, scrapes, scratches, burns, and rashes. The juice from the leaves contains tannic acid, which is very healing to the skin when used externally. The leaves also contain allantoin. This compound is also present in the comfrey plant and several other plants, and in the urine of cows and most other mammals. Allantoin is known for increasing the water content of the extracellular matrix of skin, and enhancing the flaking and peeling of upper layers of dead skin cells. This increases the smoothness of the skin, promotes cell proliferation and wound healing. And the funny part is, you're already using it! Allantoin from a urea source is frequently added to toothpaste, mouthwash, and other modern oral hygiene products.