Scleroderma: Morphea and Systemic Sclerosis Skin Signs

Overview / Definition Scleroderma is a heterogeneous group of autoimmune diseases primarily characterized by skin thickening, fibrosis, and vascular abnormalities. It is classified into two major types: morphea, which is localized scleroderma, and systemic sclerosis (SSc), which can affect multiple organ systems. The pathogenesis involves immune dysregulation leading to excessive collagen deposition, resulting in skin and organ damage. Epidemiology Scleroderma is relatively rare, affecting approximately 20 per 100,000 individuals. It predominantly affects women, with a female-to-male ratio of about 4:1. The onset typically occurs in individuals aged 30 to 50 years. Pathophysiology / Mechanism The pathophysiology of scleroderma involves several key mechanisms: Immune Activation: The disease is characterized by the activation of the immune system, leading to the production of autoantibodies. Vascular Dysfunction: Endothelial cell injury results in vascular remodeling and vasculopathy, contributing to ischemia. Fibrosis: The overproduction of collagen by fibroblasts leads to skin thickening and organ fibrosis. These processes result in the hallmark features of scleroderma, including skin changes, vascular alterations, and potential internal organ involvement. Clinical Presentation The clinical manifestations of scleroderma can vary widely based on the subtype: Morphea: Characterized by localized patches of skin thickening (plaques), which may be hypopigmented or hyperpigmented with induration. Systemic Sclerosis: Involves skin changes, including sclerodactyly, telangiectasia, and potential involvement of internal organs such as the lungs, heart, and kidneys. Common symptoms include: Skin Changes: Tightness, swelling, and thickening of the skin. Raynaud's Phenomenon: Episodes of color change in fingers and toes due to cold or stress. Gastrointestinal Symptoms: Dysmotility leading to dysphagia and gastroesophageal reflux. Pulmonary Hypertension: A severe complication of