Nevus, melanocytic, subungual - Altmeyers Encyclopedia

Definition
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Melanocytic nevus localized under the nail with dark to blackish, striated nail discoloration (Melanonychia striata longitudinalis).

A subungual melanocytic nevus in itself does not require treatment. It is important to differentiate or exclude a malignant melanoma. Therefore, in the case of striated changes, first of all exact documentation of the findings (degree of pigmentation and width of the stripe). 3-months follow-up, histological clarification is necessary if the pigmentation characteristics change. The nail is extracted under conduction anesthesia after colonel and bloodless. Since the majority of subungual melanoytic nevi is localized in the area of the nail root, spindle-shaped excision from this area. Careful histological clarification, if necessary post-excision in healthy individuals. Important: Inform patients about the consequences of this therapy! Damage to the regrowing nail is unavoidable!
In dark-skinned breeds such nail changes are very common. These are usually simple pigmentations without the risk of degeneration ( Melanonychia striata longitudinalis) and without the need for treatment.