Nail Psoriasis Injections: Treatment and Follow-Up in a Small Trial

If nail pitting or lifting appears while you are using a GLP-1 medicine, have the change assessed before choosing a treatment or covering it. A study of injections for diagnosed nail psoriasis does not establish why your nails changed or which treatment fits you.

What the small injection trial reported

An investigator-blind randomized trial from Shiraz, Iran, compared methotrexate with triamcinolone injections for nail psoriasis. Seventeen patients were recruited; 13 completed the study, contributing 65 nails assigned to methotrexate or triamcinolone. The nail count is not a patient count. [1]

There were four sessions three weeks apart and follow-up eight weeks after the last injection. Both treatments reduced modified Nail Psoriasis Severity Index scores. Triamcinolone had a greater percentage reduction at treatment's end (p = 0.015); the difference was not significant at follow-up (p = 0.906). [1]

That does not establish equivalent efficacy or long-term safety. The authors note a small sample, brief follow-up and no separate assessment of nail matrix and nail bed response. This summary uses the accessible abstract; detailed adverse-event and funding information was not verified. No GLP-1-specific result is reported. [1]

Ask which condition is affecting the nail

The American Academy of Dermatology lists pits, discoloration, crumbling, separation and buildup among nail-psoriasis signs. Nail psoriasis can occur without visible psoriasis elsewhere. It recommends telling your dermatologist about nail changes, which can also be associated with psoriatic arthritis. [2]

Describe when you first noticed the change and which nails are affected. Say whether a nail hurts, catches on clothing or makes fastening a button difficult. Tell the clinician about recent nail products and procedures and any other symptoms you want assessed. A photograph from before the change may help you describe its timing.

AAD says a dermatologist may take a clipping or scrape debris when infection is suspected, with laboratory testing to determine whether an infection also needs treatment. [2] Ask what has been diagnosed and what remains uncertain before assuming the problem is simply cosmetic.

See nail pitting before covering it for a separate introduction to the assessment.

Make the proposed treatment specific

AAD describes topical medicines, injections near affected nails and, for some people, treatment that works throughout the body. It emphasizes that nails grow slowly and improvement can take months. Tell the dermatologist if applying a treatment as directed is difficult or it has not helped. [2]

Ask for the name of the medicine and the reason it is being proposed for your findings. For an injection plan, ask where it will be given, what discomfort to expect, how that is managed and what aftercare you will need. Keep the clinician's instructions rather than copying a research protocol.

Confirm the review arrangement before beginning. A useful question is: “Which signs are we comparing at review, and how will we decide whether to continue, change the treatment or investigate further?” Ask what to do between appointments if the nail becomes more painful or another concern develops.

Keep your GLP-1 prescriber informed about new treatment. Give the dermatologist the complete medicine and supplement list so the decision can account for your health circumstances. This study is not a reason to start, stop or switch a GLP-1 medicine.

Protect the nails while following the plan

AAD's July 2026 nail-care advice recommends keeping nails short, moisturizing hands, and protecting them during manual work. For wet work, it specifies vinyl or nitrile gloves. It advises leaving cuticles alone, avoiding picking and not scraping buildup from beneath nails. [3]

It also advises skipping artificial nails because they can increase separation risk in nail psoriasis. [3] If you want cosmetic coverage, ask your dermatologist what is suitable during the proposed treatment and how appointments should be coordinated.

For a different nail concern, see lifting and discoloration assessment. Bring the concern to care as it presents rather than selecting a medicine from a study headline.

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This article provides general education, not a diagnosis or an individual treatment plan. Medication information refers to US sources. Discuss medication, nutrition and cosmetic treatment decisions with qualified clinicians.