[4] It evaluates several signs separately, each on a 1–3 scale: pitting, Beau's lines, subungual hyperkeratosis and onycholysis.

There exist numerous treatments for nail psoriasis but there is little information concerning their effectiveness and safety.

[9] Treatments include topical, intralesional, radiation, systemic, and combination therapies.

[9] As of April 2009, [needs update] an assessment of the evidence for the efficacy and safety of the treatments for nail psoriasis is in progress.

[20] A 2013 meta-analysis showed improvement of nail psoriasis with infliximab, golimumab, superficial radiotherapy, electron beam, and grenz rays compared to placebo.