Peeling Skin Syndrome 4, also known as exfoliative ichthyosis, autosomal recessive, is related to autosomal recessive epidermolytic ichthyosis and prostate cancer. An important gene associated with Peeling Skin Syndrome 4 is CSTA (Cystatin A). Affiliated tissues include skin and prostate, and related phenotypes are nail dystrophy and epidermal acanthosis