Nail Psoriasis Timeline — SCE Dermatology MCQ
Instant feedback + full explanation. One question, done properly.
Educational content. Not a substitute for clinical judgement or local policy.
Reveal the answer and explanation
Correct answer: E — 6-12 months minimum — nail growth rate means treatment effects take months to become visible in the nail plate
Nail psoriasis responds much more slowly to treatment than skin psoriasis because of the slow nail growth rate: fingernails grow approximately 0.1 mm/day (3 mm/month, full replacement 4-6 months); toenails grow approximately 0.03 mm/day (1 mm/month, full replacement 12-18 months). Therefore, treatment effects on the nail matrix (which produces the nail plate) take 4-6 months to become visible at the proximal nail and 6-12+ months for full plate replacement. Patients must be counselled about this timeline to maintain treatment adherence. Early NAPSI assessment may underestimate eventual response. IL-23 inhibitors (Guselkumab, Risankizumab) and IL-17 inhibitors (Ixekizumab) show excellent nail outcomes but only at 6-12+ month assessments.
Reference: BAD 2020 Psoriasis; Nail Psoriasis Review