Subjects with psoriasis will receive intravenous infliximab 5 mg/kg given over a 2-hour period at Weeks 0, 2, and 6 (induction therapy) to evaluate the efficacy of infliximab at Week 18. Subjects who achieved >=75% improvement in Psoriasis Pustulosa Palmoplantaris Area and Severity Index (PPPASI) score at Week 8 AND had deterioration of PPPASI score of 50% from Week 8 until Week 12 were to receive an additional infusion at Week 12.