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Many local and systemic diseases reflect in nail abnormalities. Among these, nail discolorations are prominent. They may range from white to green.
Leukonychia is a term which refers to the white discoloration of the nails. It is derived from the Greek words “leukos” and “onyx”, which mean “white” and “nail”, respectively.
Leukonychia has been grouped in various ways depending on the criterion used.
1. One division uses the pathology underlying the discoloration.
True leukonychia is usually due to systemic disease. It may be total or partial in extent, and is then called leukonychia totalis or partialis, respectively. The partial form is further divided into punctate, striate or distal leukonychias.
2. Leukonychia has also been classified by the way it develops, whether congenital or acquired.
3. Classification of leukonychia by its distribution was first done by Unna.