“…A pertinent family history and positive HLA typing for either B13, B17, B37, Cw4, or Cw6 genes, often associated with psoriasis, are also considered strongly supportive of this diagnosis [3,8,11,12]. Isolated reports of oral lesions with characteristic histological changes, in the absence of skin psoriasis [3,9], may represent manifestations of psoriasis in patients in remission from prior cutaneous disease [4,9] or those with a positive family history [4,13,14]. In the absence of the aforementioned diagnostic criteria, suspect oral findings may be considered psoriasiform mucositis rather than oral psoriasis [12].…”