"sigh" no, they were used as BLOOD PURIFIERS/EXTRACTORS. Using them as a Band-Aids would not only be pointless, it would be counterproductive; leech saliva contains anti-coagulants, so they actually make you bleed MORE. They do, however have a valuable role in the reattachment of small body parts like fingers; by their suction, they can keep the blood flowing at the point of severance, thereby minimizing tissue death and increasing the likeyhood of the re-attachment being successful. Maggots were, however sometimes used to clean out dead tissue (increasing would healing) and still are. Oh and the heads of driver ants are used as sutures.
"For I have heard the Song of War, and to me, it sounds just like "Please, Mister Custer.""
Cogito Ergot Sum, "I think there is something wrong with this rye bread." (Aplogies to Seafrol.)