Melanonychia pigmentatio nigra vel fusca laminae clavorum normalium est, et potest apparere ut inventio normalis plurium digitorum in populo Afro‑Caribbeae.
Cohors lata, profunde pigmentata, cum lineis irregularibus et extensione pigmentatae in fibras periunguales, signum est melanoma.
Melanonychia is a black or brown pigmentation of the normal nail plate, and may be present as a normal finding on many digits in Afro-Caribbeans, as a result of trauma, systemic disease, or medications, or as a postinflammatory event from such localized events as lichen planus or fixed drug eruption.
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Lineae inusitatae multiplices observantur. Melanonychia maxime benigna est, sed, si in hoc statu multae lineae irregulares sunt, biopsia considerari potest.
Multī aegerēs melanonychiam inveniunt, quod colōrem unguium brunneo‑nigrum efficit. Causa coloris unguium frequens est, quae a benignīs ad potenter gravēs, ut melanomata, variārī potest. Cohors longitudinalis melanonychiae, sicut melanonychia, ex variīs factoribus localibus vel systemicīs derivārī potest. Melanonychia is a very worrisome entity for most patients. It is characterized by brownish black discoloration of nail plate and is a common cause of nail plate pigmentation. The aetiology of melanonychia ranges from more common benign causes to less common invasive and in situ melanomas. Melanonychia especially in a longitudinal band form can be due to both local and systemic causes.
Melanonychia represents a brown to black discoloration of the nail plate that may be induced by benign or malignant causes. Two main mechanisms are involved in the appearance of melanonychias, i.e., melanocytic activation and melanocytic hyperplasia.
Cohors lata, profunde pigmentata, cum lineis irregularibus et extensione pigmentatae in fibras periunguales, signum est melanoma.