Inverted follicular keratosis

A verrucous lesion of the eyebrow

“…[ 1 2 3 5 ] IFK can present as a cutaneous horn, even a massive one. [ 1 2 3 7 ] Dermoscopic and reflectance confocal microscopy features of IFK have been described and may be helpful in its diagnosis. [ 8 ]…”

Inverted follicular keratosis simulating malignant melanoma

“…While most are reported to be pink or flesh‐coloured, they may be pigmented 1,2 , 7,9 . Inverted follicular keratoses occur most commonly on the head and neck region, particularly the eyelid, cheek, nose and upper lip 1,8 , 10 . They are most common in older Caucasian men, 1–5,8 , 10 and are usually reported to have grown over a period of several months 1,5 …”

Pigmented tumor in the nostril

“…The lesion most often arises as a solitary skin nodule on the face (85%) [4]; however, multiple IFK have been described in Cowden’s syndrome [6]. The cheek and the upper lip are the sites of predilection; other sites affected are the chin, forehead, eyebrow, nose, and eyelid [7]. Most of the lesions are between 3 and 8 mm in maximum diameter, but a few reach a size of 10 mm.…”

“…Most of the lesions are between 3 and 8 mm in maximum diameter, but a few reach a size of 10 mm. The duration of the lesion varies between six weeks and three years in most cases, and in some cases as long as 15 years has been reported [7]. …”