Keratosis Follicularis Spinulosa Decalvans, X-Linked, also known as keratosis follicularis spinulosa decalvans cum ophiasi, is related to keratosis follicularis spinulosa decalvans and keratosis, and has symptoms including photophobia An important gene associated with Keratosis Follicularis Spinulosa Decalvans, X-Linked is MBTPS2 (Membrane Bound Transcription Factor Peptidase, Site 2). Affiliated tissues include skin and eye, and related phenotypes are photophobia and palmoplantar keratoderma