Ichthyosis follicularis in two girls: an autosomal dominant disorder.

Ichthyosis follicularis (IF) is a rare disorder of keratinization that has been described primarily in males and proposed as a possible X-linked disorder. We report two black girls with nonscarring alopecia; photophobia; follicular hyperkeratoses; hyperkeratosis of the extensor aspects of the hands, knees, and elbows; fixed, erythematous, perineal plaques; and angular cheilitis who seem to fit the clinical criteria for IF. One girl also had gingival hypertrophy and a hearing deficit. One child's father had identical symptoms. We propose that these girls may have a variant of IF that is inherited as an autosomal dominant trait.