Psoriatic onychodystropy

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Psoriatic nails
Psoriasis of the toenails
Classification and external resources
Specialty dermatology
ICD-10 L62.8

Psoriatic onychodystrophy or psoriatic nails is a nail disease. It is common in those suffering from psoriasis, with reported incidences varying from 10% to 78%. Elderly patients and those with psoriatic arthritis are more likely to have psoriatic nails.[1]:781–2


Psoriatic nails are characterized by a translucent discolouration in the nail bed that resembles a drop of oil beneath the nail plate.[2] Early signs that may accompany the "oil drop" include thickening of the lateral edges of the nail bed with or without resultant flattening or concavity of the nail; separation of the nail from the underlying nail bed, often in thin streaks from the tip-edge to the cuticle; sharp peaked "roof-ridge" raised lines from cuticle to tip; or separation of superficial layers of the nail followed by loss of patches of these superficial layers, leaving thin red nails beneath; or nail pitting–punctate changes along the nail plate surface.


The causes of nail psoriasis are unknown. It has been suggested that fungi may play a role.[3]


The Nail Psoriasis Severity Index (NAPSI) is a numeric, reproducible, objective, simple tool for evaluation of nail psoriasis.[4] It evaluates several signs separately, each on a 1–3 scale: pitting, Beau's lines, subungual hyperkeratosis and onycholysis. A 2005 study proposed a modified NAPSI scale for persons with psoriasis and named the title of their publication "Modification of the Nail Psoriasis Severity Index".[5] Then, in 2007, a study found that there was a high level of inter-rater variability of the 2003 NAPSI scale and proposed another index which was, like the 2005 article, a modification of the 2003 article, and was named modified NAPSI.[6] A 2008 study found that Cannavo's qualitative system[7] correlated with NAPSI (P<0.001) and is less time-consuming.[8]

Onycholysis: Separation of the nail plate from the nail bed

There is a risk of misdiagnosis with onychomycosis.


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.

Relative effectiveness of treatments[edit]

Available studies lack sufficient power to extrapolate a standardized therapeutic regimen.[9] As of April 2009, an assessment of the evidence for the efficacy and safety of the treatments for nail psoriasis is in progress.[20]

  • Infliximab appears to be the most effective treatment for nail psoriasis to date.[21]
  • Results from low-dose acitretin therapy show NAPSI score reductions comparable with those studies evaluating biologic drugs for nail psoriasis and suggest that low-dose systemic acitretin should be considered in the treatment of nail psoriasis.[21]


Active clinical trials investigating nail psoriasis:[22]

Phase IV[edit]

Phase II[edit]

See also[edit]


  1. ^ James, William; Berger, Timothy; Elston, Dirk (2005). Andrews' Diseases of the Skin: Clinical Dermatology. (10th ed.). Saunders. ISBN 0-7216-2921-0.
  2. ^ Kouskoukis, C.; Scher, R.; Ackerman, A. (1983). "The "oil drop" sign of psoriatic nails. A clinical finding specific for psoriasis". The American Journal of dermatopathology. 5 (3): 259–262. PMID 6625117. doi:10.1097/00000372-198306000-00012. 
  3. ^ Szepietowski, C.; Salomon, J. (Nov 2007). "Do fungi play a role in psoriatic nails?". Mycoses. 50 (6): 437–442. ISSN 0933-7407. PMID 17944702. doi:10.1111/j.1439-0507.2007.01405.x. 
  4. ^ Rich, P.; Scher, R. (2003). "Nail Psoriasis Severity Index: A useful tool for evaluation of nail psoriasis". Journal of the American Academy of Dermatology. 49 (2): 206–212. PMID 12894066. doi:10.1067/S0190-9622(03)00910-1. 
  5. ^ Parrish, CA; Sobera, JO; Elewski, BE (October 2005). "Modification of the Nail Psoriasis Severity Index.". Journal of the American Academy of Dermatology. 53 (4): 745–6; author reply 746–7. PMID 16198816. doi:10.1016/j.jaad.2004.11.044. 
  6. ^ Cassell, S.; Bieber, J.; Rich, P.; Tutuncu, Z.; Lee, S.; Kalunian, K.; Wu, C.; Kavanaugh, A. (2007). "The modified Nail Psoriasis Severity Index: Validation of an instrument to assess psoriatic nail involvement in patients with psoriatic arthritis". The Journal of rheumatology. 34 (1): 123–129. PMID 17216680. 
  7. ^ Cannavò, S. P.; Guarneri, F.; Vaccaro, M.; Borgia, F.; Guarneri, B. (2003). "Treatment of Psoriatic Nails with Topical Cyclosporin: A Prospective, Randomized Placebo-Controlled Study". Dermatology. 206 (2): 153–156. PMID 12592084. doi:10.1159/000068469. 
  8. ^ Kaçar, N.; Ergin, Ş.; Erdo?an, B. (2007). "The comparison of Nail Psoriasis Severity Index with a less time-consuming qualitative system". Journal of the European Academy of Dermatology and Venereology. 22 (2): 219–22. PMID 18211416. doi:10.1111/j.1468-3083.2007.02389.x. 
  9. ^ a b Jiaravuthisan, M. M.; Sasseville, D.; Vender, R. B.; Murphy, F.; Muhn, C. Y. (2007). "Psoriasis of the nail: Anatomy, pathology, clinical presentation, and a review of the literature on therapy". Journal of the American Academy of Dermatology. 57 (1): 1–27. PMID 17572277. doi:10.1016/j.jaad.2005.07.073. 
  10. ^ Balbás, G. M.; Regaña, M. S.; Millet, P. U. (2009). "Tacalcitol ointment for the treatment of nail psoriasis". Journal of Dermatological Treatment. 20 (5): 308–310. PMID 19367480. doi:10.1080/09546630902787585. 
  11. ^ Snchez Regaa, M.; Mrquez Balbs, G.; Umbert Millet, P. (2008). "Nail psoriasis: A combined treatment with 8 clobetasol nail lacquer and tacalcitol ointment". Journal of the European Academy of Dermatology and Venereology. 22 (8): 963–969. PMID 18410337. doi:10.1111/j.1468-3083.2008.02679.x. 
  12. ^ Fiallo, P. (2009). "Yellow nails as an adverse reaction to the topical use of 5-fluorouracil for the treatment of nail psoriasis". Journal of Dermatological Treatment. 20 (5): 299–301. PMID 19363737. doi:10.1080/09546630902773494. 
  13. ^ Tzung, T.; Chen, C.; Yang, C.; Lo, P.; Chen, Y. (2008). "Calcipotriol used as monotherapy or combination therapy with betamethasone dipropionate in the treatment of nail psoriasis". Acta dermato-venereologica. 88 (3): 279–280. PMID 18480933. doi:10.2340/00015555-0401. 
  14. ^ Rigopoulos, D.; Gregoriou, S.; Daniel, III, C. R.; Belyayeva, H.; Larios, G.; Verra, P.; Stamou, C.; Kontochristopoulos, G.; Avgerinou, G.; Katsambas, A. (2009). "Treatment of Nail Psoriasis with a Two-Compound Formulation of Calcipotriol plus Betamethasone Dipropionate Ointment". Dermatology. 218 (4): 338–341. PMID 19212110. doi:10.1159/000202179. 
  15. ^ Lamerson, C.; Stevens, G.; Sax, K. (2008). "Treatment of nail psoriasis with efalizumab: A preliminary study". Cutis; cutaneous medicine for the practitioner. 82 (3): 217–220. PMID 18856162. 
  16. ^ Rigopoulos, D.; Gregoriou, S.; Stratigos, A.; Larios, G.; Korfitis, C.; Papaioannou, D.; Antoniou, C.; Ioannides, D. (2008). "Evaluation of the efficacy and safety of infliximab on psoriatic nails: An unblinded, nonrandomized, open-label study". British Journal of Dermatology. 159 (2): 453–456. PMID 18565184. doi:10.1111/j.1365-2133.2008.08686.x. 
  17. ^ a b Clinical trial number NCT00265096 at
  18. ^
  19. ^ Saleem, K.; Azim, W. (2008). "Treatment of nail psoriasis with a modified regimen of steroid injections". Journal of the College of Physicians and Surgeons--Pakistan : JCPSP. 18 (2): 78–81. PMID 18454890. 
  20. ^ "Interventions for nail psoriasis". Protocols. doi:10.1002/14651858.CD007633. 
  21. ^ a b Noiles, K.; Vender, R. (2009). "Nail psoriasis and biologics". Journal of cutaneous medicine and surgery. 13 (1): 1–5. PMID 19298765. doi:10.2310/7750.2008.08012. 
  22. ^
  23. ^ Clinical trial number NCT00581100 at
  24. ^ Clinical trial number NCT00666354 at

External links[edit]