In a medical point of view, urtication, or stinging with nettles, is a practice not sufficiently appreciated.
urtication ur·ti·ca·tion (ûr'tĭ-kā'shən)
n.
The formation or development of urticaria.
The sensation of having been stung by nettles.
A lashing with nettles formerly used to treat a paralyzed part of the body.