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Anonychia (DermNet NZ lichen-planus-nail-046).jpg
SymptomsAbsent or small nails[1]

Anonychia is the absence of finger or toe nails.[1]

It may be the result of a congenital ectodermal defect, ichthyosis, severe infection, severe allergic contact dermatitis, self-inflicted trauma, Raynaud phenomenon, lichen planus, epidermolysis bullosa, or severe exfoliative diseases.[2] It can also occur in severe psoriasis.[1] It may occur on its own due to a mutation in the RSPO4 gene.[3] It occurs in nail-patella syndrome.[1]

It is rare.[2]

Congenital form

This is rare and is usually due to mutations in the R-spondin 4 (RSPO4) gene which is located on the short arm of chromosome 20 (20p13).[4]

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See also


  1. 1.0 1.1 1.2 1.3 MacGilchrist, Claire (2020). "3. The skin and nails in podiatry". In Burrow, J. Gordon; Rome, Keith; Padhiar, Nat (eds.). Neale's Disorders of the Foot and Ankle (9th ed.). Elsevier. p. 52. ISBN 978-0-7020-6504-0.
  2. 2.0 2.1 2.2 James, William D.; Elston, Dirk; Treat, James R.; Rosenbach, Misha A.; Neuhaus, Isaac (2020). "33. Diseases of the skin appendages". Andrews' Diseases of the Skin: Clinical Dermatology (13th ed.). Edinburgh: Elsevier. p. 782. ISBN 978-0-323-54753-6.
  3. Bellet, Jane Sanders (2021). "Paediatric nail disorders". In Lipner, Shari (ed.). Nail Disorders: Diagnosis and Management, An Issue of Dermatologic Clinics. Philadelphia: Elsevier. pp. 232–233. ISBN 978-0-323-70923-1. Archived from the original on 2022-05-08. Retrieved 2023-05-16.
  4. Khan TN, Klar J, Nawaz S, Jameel M, Tariq M, Malik NA, Baig SM, Dahl N (2012) Novel missense mutation in the RSPO4 gene in congenital hyponychia and evidence for a polymorphic initiation codon (p.M1I). BMC Med Genet 13(1):120

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