I just love nature! I have just learned that celandine used to be known as pilewort (previously figwort as this used to be the name for piles). Going back to the Doctrine of Signatures, if a plant looked like or resembled a body part it would cure an ailment there. Before you all go out looking to stuff your faces with the stuff it does contain a mild toxin so medicines should be made from the dried herb or by heat extraction.
An easier method is to use bilberries though - just give them a squeeze (the berries, not the sore bits!) and rub them on the area in question. They are not out just yet though!