Childhood Psoriasis: Unique Features and Management

Overview / Definition Childhood psoriasis is a chronic, autoimmune skin disorder characterized by rapid skin cell proliferation leading to thick, scaly plaques. It can occur at any age, but the onset typically occurs before the age of 16, with varying degrees of severity and different clinical presentations compared to adult psoriasis. Epidemiology Psoriasis affects approximately 1-3% of the general population, with childhood psoriasis accounting for a significant subset. The onset can occur in early childhood, with a peak incidence between 2-10 years of age: Family history is a significant risk factor, and up to 30% of children with psoriasis have a first-degree relative with the condition. Psoriasis is equally prevalent in both genders, although some studies suggest a slight male predominance. Pathophysiology / Mechanism The pathophysiology of psoriasis involves a complex interplay of genetic, immunologic, and environmental factors that contribute to the dysregulation of the immune system: T-cell activation: CD4+ and CD8+ T-cells become activated, releasing pro-inflammatory cytokines such as TNF-α, IL-17, and IL-23. Keratinocyte proliferation: Increased cytokine levels lead to the hyperproliferation of keratinocytes, resulting in the characteristic plaques of psoriasis. Genetic predisposition: Several susceptibility loci (e.g., PSORS1) have been identified, indicating a strong genetic component to the disease. Clinical Presentation Childhood psoriasis may present in various forms, including: Guttate psoriasis: Often precipitated by streptococcal infections, characterized by drop-shaped lesions on the trunk and limbs. Plaque psoriasis: The most common type, presenting as well-defined, erythematous plaques covered with silvery-white scale. Pustular psoriasis: Rare in children, presenting with pustules and systemic symptoms. Nail involvement: Nail pitting, onycholysis, and discoloration may occur, often leading to significant morbidity. Psoriatic arthritis: Approxima