EXHIBIT 32(a)

                            CERTIFICATION PURSUANT TO
                             18 U.S.C. SECTION 1350,
                             AS ADOPTED PURSUANT TO
                  SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

      In connection with the annual report of DUSA Pharmaceuticals, Inc. (the
"Company") on Form 10-K for the year ended December 31, 2005, as filed with the
Securities and Exchange Commission (the "Report"), I, D. Geoffrey Shulman,
Chairman and Chief Executive Officer of the Company, certify, pursuant to 18
U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley
Act of 2002, that:

      1)    The Report fully complies with the requirements of Section 13(a) or
            15(d) of the Securities Exchange Act of 1934; and

      2)    The information contained in the Report fairly presents, in all
            material respects, the financial condition and results of operations
            of the Company.

Date: March 10, 2006                       /s/ D. Geoffrey Shulman
                                           -------------------------------------
                                           D. Geoffrey Shulman
                                           Chairman and Chief Executive
                                           Officer (principal executive officer)