Subungual Hyperkeratosis - Causes and Symptoms

Subungual Hyperkeratosis – Causes and Symptoms


Subungual hyperkeratosis is a nail deformity characterized by keratinization of the nail bed and / or hyponychium. Consequently, near its distal edge, the nail plate appears thickened and raised by an accumulation of scales. This deposit can be of various thicknesses, more or less adherent and yellowish-white or silvery-white in colour.

Possible consequences of subungual hyperkeratosis are onycholysis (detachment of the nail) and the “crumble” of the nail plate. Subungual hyperkeratosis is often associated with microtrauma or fungal infection ( onychomycosis ). Furthermore, it is a very frequent and characteristic sign of nail psoriasis .

Possible Causes Of Subungual Hyperkeratosis

Subungual hyperkeratosis is a common or probable symptom of these diseases

Common Causes

Rare Causes

  • Paronychia
  • Psoriasis

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