Nail dystrophy - Clavus Dystrophyhttps://en.wikipedia.org/wiki/Nail_disease
Dystrophia Unguis (Nail dystrophy) morbus est vel unguis deformitas propter ignotam inflammationem. In circiter dimidium casus unguis suspecti fungus infectio non est actu fungal. Solum dystrophia unguis erat.

Dystrophia unguis saepe misdiagnositur sicut onychomycosis et curatur. Ante initium therapiae antifungalis provisor sanitatis infectio fungalis confirmare debet. Administratio curationis personarum sine contagione supervacua est cura sanitatis et causarum partium supervacuum est.

Curatio
Iniectio intralesionalis corticosteroidis potest tentari ad tractandum dystrophiam unguis.

Curatio OTC Medicamenta
Fugiat actiones quae unguibus laedere possunt, ut pediludium vel hiking. Curatio antifungalis inefficax est, quia dystrophia unguis non causatur ex contagione fungali.

☆ AI Dermatology — Free Service
In anno 2022 Stiftung Warentest ex Germania provenit, satisfactio consumptoria cum ModelDerm paulo minus fuit quam cum consultationibus telemedicinis solutis.
  • Dystrophia medianis unguis (Median nail dystrophy) non est causata infectione fungina.
  • Onychodystrophia (Nail dystrophy) plures digitos involventes.
References Trachyonychia and Twenty-Nail Dystrophy: A Comprehensive Review and Discussion of Diagnostic Accuracy 27843915 
NIH
Trachyonychia, seu dystrophia viginti unguium (twenty‑nail dystrophy), significat tenues, fragiles ungues, cum multis iugis longitudinaliter decurrentibus. Aliquando, dystrophia viginti unguium (twenty‑nail dystrophy) erronea describitur ad alias condiciones quae omnes viginti ungues afficiunt.
The term trachyonychia, also known as twenty-nail dystrophy, is used to describe thin, brittle nails with excessive longitudinal ridging. The term twenty-nail dystrophy has been incorrectly applied to other conditions that can affect all twenty nails.
 Median nail dystrophy - Case reports 33318093 
NIH
Vir XXXIV annos natus ad medicum regularem suum profectus est, quod massas sine dolore in utroque suo unguis per XX annos habuit. Non recordatus est unguis laedere aut infectionem fieri. Utroque pollice sulcus directus per medium, abietis instar, lineis transversis erat.
A 34-year-old man presented to his primary care physician with a 20-year history of painless bilateral thumbnail lesions. The patient had no history of nail trauma or infection. Both thumbs had a central linear depression in a fir tree pattern, surrounded by parallel transverse ridges.
 Nail cosmetics: What a dermatologist should know! 37317711
Cum maxime cosmetica unguium fere tuta sunt, adhuc possunt quaestiones ducere sicut reactiones allergicae, irritationes, infectiones, et problemata mechanica. Notandum est multae procedurae cosmeticae unguium a artificibus pulchritudinis peraguntur, qui cognitionem anatomiae et functionis unguis carere possunt, potius quam dermatologi. Accedit praxis hygienica in salonibus unguium et locis pulchritudinis variantur, quae in acutis quaestionibus sicut paronychia et dystrophia unguis ob injuriam matricis provenire possunt.
While most nail cosmetics are generally safe, they can still lead to issues such as allergic reactions, irritations, infections, and mechanical problems. It's worth noting that many of nail cosmetic procedures are carried out by beauticians who may lack proper knowledge of nail anatomy and function, rather than dermatologists. Additionally, the hygiene practices in nail salons and beauty parlors vary, which can result in acute problems like paronychia and nail dystrophy due to matrix injury.