This study involves a comparison of adalimumab administered sub-cutaneously with a loading dose of 80 mg followed by 40 mg at week 1 and 40 mg every other week thereafter for a total of 10 injections (two 40 mg injections at week 0 for a total dose of 80 mg, followed by single injections at weeks 1, 3, 5, 7, 9, 11, 13 and 15) with non systemic treatments for psoriasis (topical therapy and/or UVB therapy). Patients will be randomized (2:1) to either adalimumab or topical and/or UVB therapy for psoriasis.