Skin disorders with arthritis.

Many inflammatory, metabolic and infectious diseases affect the skin and joints. Most of these, such as rheumatoid arthritis and systemic lupus erythaematosus, are considered to be rheumatic conditions with secondary skin involvement. However, several primary cutaneous diseases are associated with arthritis and may even present with joint symptoms prior to cutaneous lesions. Common skin disorders, such as acne and psoriasis, have well-known musculoskeletal manifestations. Other less common conditions, such as dermatomyositis, multicentric reticulohistiocytosis, pyoderma gangrenosum, Sweet's syndrome and various cutaneous vasculitides, also have frequent joint involvement. This review will discuss the clinical presentation, both cutaneous and musculoskeletal, diagnosis and management of these disorders.