Melanonychiahttps://en.wikipedia.org/wiki/Melanonychia
Melanonychia o le lanu uliuli po'o le lanu enaena o le ipu masani, ma e mafai ona avea ma se su'esu'ega masani i le tele o matā i tagata Afro‑Caribbean.

O se pa'u lautele, loloto, ma laina e le masani ai, fa'alautele i le periungual, o se fa'ailoga mo le melanoma.

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  • E le masani ai le tele o laina e matauina. Melanonychia o le lanu uliuli po o le lanu lapopo i le pusa masani. Ae afai e tele ni laina fa'aletonu i lea tulaga, e ono faia se biopsy.
  • Muehrcke's lines
  • Brown banding
References Melanonychia: Etiology, Diagnosis, and Treatment 32055501 
NIH
O le tele o tagata maua le melanonychia, aua e mafua ai le lanu ena‑ena uliuli o le ipu fao. O se mafuaʻaga masani o le faʻalilolilo o le fao, ma e mafai foi ona tupu i le faʻaletonu i le ogaoga, e pei o le melanoma. O le melanonychia fa‘aumiumi e mafai ona afua mai i mea eseese i le lotoifale poʻo le faʻalapotopotoga.
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.