Nail Signs due to abnormal nail matrix function – sandpapered nails 粗面甲

Trachyonychia (sandpapered nails) presents as a rough surface affecting all of the nail plate and up to 20 nails (20 nails dystrophy). The affected nails are opaque, lusterless and rough; the nail plate surface has longitudinal ridging due to fine superficial striations distributed in a regular, parallel sandpapered patten. Conditions that may cause trachyonychia include alopecia areata (common), lichen planus (uncommon), psoriasis (rare), and eczema (very rare). There is some response to potent topical, locally injected and systemic steroids, but this may be temporary.

Trachyonychia1

粗面甲,甲板粗糙如砂纸,影响所有指甲板和多达20个指甲(20指甲营养不良)。受影响的指甲是不透明的,没有光泽和粗糙的;甲板表面具有纵向皱纹如同细小的表面条纹分布在规则的砂纸图案中。可能导致粗面甲的病症包括斑秃的(常见),扁平苔藓(不常见),牛皮癣(罕见)和湿疹(非常罕见)。此症也可能是强效类固醇局部外用,局部注射类固醇和系统性类固醇治疗后的一些反应,但这可能是暂时性的。

Reference

  1. N Zaias: The Nail in Health and Diseases. 2nd ed 1990 Appleton & Lange Connecticut
  2. KA Gordon, JM Vega, A Tosti: Trachyonychia: a comprehensive review. Indian J Dermatol Venereol Leprol. 77:640-645 2011
  3. David AR Berker, Bertrand Richart, Robert Baran In: Christopher Griffiths, Jonathan Barker, Tanya Bleiker, Robert Chalmers & Daniel Creamer, editors. Rook’s Textbook of Dermatology, 9th edition. Wiley Blackwell; 2016. p95.11