Efficacy and Safety of Tazarotene Gel in Nail Psoriasis

Inclusion Criteria: * Key inclusion criteria: * Mild to moderate nail psoriasis on at least one fingernail Exclusion Criteria: Key exclusion criteria: * any other skin condition, with a potential to affect the nails or to interfere with evaluation of the disease; * history of hypersensitivity to retinoids or to other components of the trial medication * topical treatment of nails with antipsoriatics in the 4 weeks preceding the treatment phase; * systemic treatment of psoriasis within the three months before the treatment phase of the trial or during the trial * intralesional steroid injection before the treatment phase of the trial * phototherapy before the treatment phase of the trial; * any chronic infection or condition capable of interfering with the conduct of the trial; * evidence of drug or alcohol abuse; * symptoms of a clinically significant illness that may influence the outcome of the trial in the four weeks preceding the treatment phase of the trial; * participation in another clinical trial within the last 4 weeks prior to first treatment in this clinical trial; * pregnancy or nursing;