Have you got acne? You might want to stock up on leeches. The ancient remedy that's making a comeback...

The days of using leeches to cure what ails you may seem long gone...

...but they're making a comeback. Leeching has been around for more than 2,500 years treating all sorts of ailments. Some civilized nations still use leeches to treat everyday conditions such as acne gout, arthritis, vertigo and sinusitis. 

The slimy saliva that leeches excrete contain an enzyme that helps to prevent clotting and increases blood flow to damaged tissue. Some hospitals keep a supply of leeches on hand, even in the U.S. They fall under the medical term of biotherapy and are used for specific procedures where there is a need for the gradual draining or flow of blood.