Nail Psoriasis: Clinical Features and Targeted Treatment

Overview / Definition Nail psoriasis is a chronic inflammatory condition that affects the nails, often seen in conjunction with skin psoriasis. It can manifest as pitting, onycholysis, and discoloration, leading to functional impairment and cosmetic concerns. Epidemiology Nail psoriasis occurs in approximately 50-80% of patients with psoriasis. It can also be seen in psoriatic arthritis, affecting about 80% of individuals with this condition. The onset is typically in the 20s to 30s, but it can occur at any age. Pathophysiology / Mechanism The pathophysiology of nail psoriasis involves an autoimmune mechanism where T lymphocytes infiltrate the nail matrix and bed, leading to altered keratinocyte proliferation and differentiation. Key factors include: Genetic Predisposition: Family history of psoriasis increases the risk. Environmental Triggers: Trauma, infections, and stress can exacerbate symptoms. Immune Dysregulation: Involvement of cytokines such as TNF-alpha, IL-17, and IL-23. Clinical Presentation Nail psoriasis presents with a variety of clinical features, which may include: Pitting: Small depressions on the nail surface. Onycholysis: Separation of the nail from the nail bed. Subungual Hyperkeratosis: Accumulation of keratin under the nail. Nail Discoloration: Yellow-brown or opaque appearance of the nails. Deformed Nails: Irregular nail edges and changes in shape. Diagnosis / Workup The diagnosis of nail psoriasis is primarily clinical. Key steps include: Patient History: Assess for family history of psoriasis and duration of symptoms. Physical Examination: Inspect nails and surrounding skin for psoriatic lesions. Differential Diagnosis: Consider other conditions such as: A fungal infection (onychomycosis) Trauma Dermatophyte infections Contact dermatitis Diagnostic Tests: Nail clippings for mycology if fungal infection is suspected. Treatment / Management Management of nail psoriasis can be challenging and often requires a multimodal approach. Treatment opt