Uguisu no fun

Uguisu no fun (鶯の糞, literally meaning "nightingale faeces" in Japanese), also called the "Geisha Facial", refers to the excrement (fun) produced by a particular nightingale, the Japanese bush warbler (uguisu). The droppings have been used in facials throughout Japanese history. Recently, the product has appeared in the Western world. The facial is said to whiten the skin and balance skin tone, as well as treat skin affected by hyperpigmentation.