Pilonidal disease was first described by Hodges in 1880 and is diagnosed by the finding of a characteristic epithelial track (the sinus) situated in the skin of the natal cleft, a short distance behind the anus and generally containing hair, hence the name pilonidal taken from the Latin, meaning literally 'nest of hairs'. During the Second World War the condition was common in jeep drivers, which led to it being known as 'jeep disease'. A similar condition arises in the clefts between the fingers of barbers or hairdressers caused by customers' hair entering moist, damaged skin.