Melanonychiahttps://en.wikipedia.org/wiki/Melanonychia
Ko te Melanonychia he pango, parauri rānei o te pereti whao noa, ā, tērā pea he kitenga noa i runga i ngā mati maha o ngā tāngata Afro‑Caribbean.

Ko te rōpū whānui, hohonu, me ngā raina korikori me te toronga whakapuranga ki runga i ngā kopa periungual he tohu mō te melanoma.

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  • Ka kitea he maha o ngā rarangi rereke. Ko te nuinga o te Melanonychia he pai, engari mēnā he maha ngā raina kopikopiko i tēnei taumata, ka whakaarohia he koiora.
  • Muehrcke's lines
  • Brown banding
References Melanonychia: Etiology, Diagnosis, and Treatment 32055501 
NIH
He maha ngā turoro e pā ana ki te melanonychia, nā te mea ka puta he pango, parauri‑pango o te pereti whāo. He take maha mō te paheketanga o ngā whāo, me ngā take mai i te ngawari ki te tino kino, pērā i te melanoma. Ko te melanonychia, rite ki te roopu roa, ka puta mai i ngā momo ahuatanga o te rohe, o te pūnaha rānei.
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 – Clues for a Correct Diagnosis 32064201 
NIH
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.