Study to Evaluate the Efficacy and Safety of P-3073 Nail Solution in the Treatment of Nails Affected by Psoriasis

Inclusion Criteria: * Written informed consent before starting any study related procedures * Patients aged 18 to 80 years old of any race. * Males or females. * Patients with mild to moderate psoriastic fingernail(s) defined as fingernail/s with matrix psoriasis NAPSI score and/or bed psoriasis NAPSI score ≥ 1 and ≤ 3 at baseline. * In case of skin involvement, patients with established clinical diagnosis of mild-to-moderate psoriasis (BSA involvement ≤ 8% or PASI ≤ 10) Exclusion Criteria: * Woman who is pregnant, nursing an infant, or planning a pregnancy during the study period. * Use of any systemic treatment for psoriasis during the last six months before the screening visit. * Use of photochemotherapy or other forms of radiotherapy during the last four weeks before the screening visit. * Positive mycology findings * Systemic use of immunosuppressives, chemotherapy and corticosteroids during last three months before the screening visit. * Consumption of Vitamin D or its analogues during the last three months. * History of hypercalcaemia or hypercalciuria. * HIV infection or any other immunodeficiency. * Alcohol or substance abuse. * Patients with history of allergic reactions to calcipotriol or its excipients.