Some authors have stated that nail pitting never occurs in Reiter's syndrome. The case of a patient with incomplete Reiter's syndrome with nail pitting and HLA-A2, 28; B18, 27 is presented. Patients who have both psoriasis and Reiter's syndrome have demonstrated increased frequency of HLA-A2 and B27 and markedly decreased frequency of HLA loci associated with psoriasis.⁹ The particular finding of nail pitting is presented to illustrate that this change may occur in Reiter's syndrome and may reflect a predisposition to the development of psoriasis or psoriasiform lesions conferred by HLA-A2 with B27, as suggested by previously reported HLA typing studies.