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Melanonychia
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Overview of Melanonychia 
Melanonychia produces a solitary dark band in the nail. This condition occurs most commonly in Blacks and Asians. When it is seen in Caucasians, there is an increased chance of it representing a malignant process.
Causes of Melanonychia
Melanonychia may reflect a mole or nevus involving the nail matrix, or origin of the nail. However, in may be caused by a melanoma, particularly in Caucasians. A biopsy may be necessary to determine the underlying cause.
Signs and Symptoms of Melanonychia
In this condition, a solitary longitudinal band is seen in the nail matrix or nail bed. It is hyperpigmented, or darker, than the normal adjacent skin. It is oriented along the long axis of the finger.
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Medical Content Last Updated on 07/12/2008
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