MBTPS2 and keratosis follicularis spinulosa decalvans: Nonscarring generalized alopecia, psoriasiform lesions, follicular keratosis, ichthyosis vulgaris phenotype, and photophobia can also be found in X‐linked genodermatosis ichthyosis follicularis, atrichia and photophobia (IFAP) syndrome, and keratosis follicularis spinulosa decalvans (KFSD) (Mégarbané & Mégarbané, 2011), and these symptoms have been proven to be caused by mutations in membrane‐embedded zinc metalloprotease/site‐2 protease (MBTPS2, S2P) and sterol regulatory element‐binding protein 1 (SREBP1).