title: Pigmented tumor in the nostril.
abstract: A 64-year-old man was noted to have a single pigmented lesion in the nostril of his nose. Clinical examination revealed a 5 mm nodular growth and brown lesion. With a presumed clinical diagnosis of malignant skin tumor, a biopsy was performed. The histological examination revealed the unexpected diagnosis of pigmented inverted follicular keratosis. The inverted follicular keratosis is an uncommon benign lesion that is usually diagnosed histologically rather than clinically. It commonly simulates other proliferative skin lesions.
authors.affiliation: Dermatology Department, La Rabta Hospital, Tunis, Tunisia.
authors.forename: Nawel
authors.initials: N
authors.lastname: Jaada
authors.affiliation: Dermatology Department, La Rabta Hospital, Tunis, Tunisia.
authors.forename: Ines
authors.initials: I
authors.lastname: Zaraa
authors.affiliation: Pathology Department, La Rabta Hospital, Tunis, Tunisia.
authors.forename: Ines
authors.initials: I
authors.lastname: Chelly
authors.affiliation: Dermatology Department, La Rabta Hospital, Tunis, Tunisia.
authors.forename: Rym
authors.initials: R
authors.lastname: Cheikhrouhou
authors.affiliation: Dermatology Department, La Rabta Hospital, Tunis, Tunisia.
authors.forename: Sondes
authors.initials: S
authors.lastname: Trojjet
authors.affiliation: Dermatology Department, La Rabta Hospital, Tunis, Tunisia.
authors.forename: Dalenda El
authors.initials: DE
authors.lastname: Euch
authors.affiliation: Dermatology Department, La Rabta Hospital, Tunis, Tunisia.
authors.forename: Mourad
authors.initials: M
authors.lastname: Mokni
authors.affiliation: Pathology Department, La Rabta Hospital, Tunis, Tunisia.
authors.forename: Slim
authors.initials: S
authors.lastname: Haouet
authors.affiliation: Dermatology Department, La Rabta Hospital, Tunis, Tunisia.
authors.forename: Amel
authors.initials: A
authors.lastname: Ben Osman
keywords: inverted follicular keratosis; seborrheic keratosis