Olmsted Syndrome, X-Linked, also known as olmsx, is related to mutilating palmoplantar keratoderma with periorificial keratotic plaques and alopecia. An important gene associated with Olmsted Syndrome, X-Linked is MBTPS2 (Membrane Bound Transcription Factor Peptidase, Site 2). Affiliated tissues include skin, and related phenotypes are hyperkeratosis and palmoplantar keratoderma