Inverted follicular keratosis (IFK) is a rare benign tumor characterized by endophytic proliferation originating from the infundibulum of the hair follicle (1,2). Although not frequently encountered, we believe that inverted follicular keratosis should be considered a distinct entity to keep in mind due to its potential to be confused with conditions such as verruca vulgaris, seborrheic keratosis, actinic keratosis, keratoacanthoma, basal cell carcinoma, and squamous cell carcinoma.
Gökkaya et al. (Mon,) studied this question.