Four new examples of fistula of the dorsum of the nose were studied. The clinical appearance of a tuft of hair protruding from a pit on the midline of the dorsum of the nose is virtually pathognomonic; the fistula communicates with a dermoid cyst located in the deeper tissues. Though the condition is a cutaneous marker of an underlying lesion, It has been almost completely neglected in the dermatologic literature.
Brownstein MH, Shapiro L, Slevin R. Fistula of the Dorsum of the Nose. Arch Dermatol. 1974;109(2):227-229. doi:10.1001/archderm.1974.01630020043011