TNF-α plays a major role in the pathophysiology of both Psoriasis（PsO）and Psoriatic Arthritis (PsA). TNF-α levels are elevated in psoriatic skin lesions, serum samples, and synovial fluid. Anti-TNF-α therapy has shown efficacy in treating psoriatic skin lesions, joint pain and swelling, enthesitis, and dactylitis plus the ability to improve mobility, reduce radiographic progression of disease, and influence quality of life parameters.