Scrotal tongue is also known as grooved, furrowed, wrinkled, fluted, plicated or ribbed tongue. According to Prinz and Greenbaum1 scrotal tongue affects about one half per cent of the population.
The anomaly is usually familial or congenital. It involves the dorsum of the tongue, which may be lobulated or present convolutions or ridges similar to the topography of the scrotum. The ordinary markings of the surface of the tongue are exaggerated and the fungiform papillae are prominent. In some cases the grooves radiate from a central depression resembling the ribs of a leaf. The size and number of grooves, which are often symmetric, are variable.
The surface of the tongue may present a glazed appearance, and in about 25 per cent of the cases there is some evidence of macroglossia which may cause perlèche.
According to Cockayne2 the anomaly is inherited as an irregular dominant.
TOBIAS N. SCROTAL TONGUE AND ITS INHERITANCE. Arch Derm Syphilol. 1945;52(4):266. doi:10.1001/archderm.1945.01510280050011