- Subject must have body surface area (BSA) ≥ 10% and a target fingernail Modified Nail Psoriasis Severity Index (mNAPSI) ≥ 8 at Week 0, OR BSA ≥ 5%, a target fingernail mNAPSI ≥ 8 and a total mNAPSI score of ≥ 20 at Week 0.