Blue nevushttps://en.wikipedia.org/wiki/Blue_nevus
Blue nevus species est nevus coloratus, typice unum nodulum bene demarcatum caeruleum vel nigrum. Color caeruleus nevi causatur ex cellulis pigmentariis in cute profunda.

Fit interdum biopsy vel tota laesio chirurgica. Exitus clinicus plerumque bonus est, et casus mutationis carcinomatosae rarus est. Diagnostica differentialis includit dermatofibroma et melanoma.

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  • Quia cellulae nevus penitus praesentes sunt, caeruleum apparet.
  • Exemplum atypicum Blue nevus plerumque symmetriam figuram habet. Cellula basalis carcinoma et melanoma in talibus debent distinguī.
References Blue Nevus 31747181 
NIH
Blue nevus refertur ad globos cutis a incremento melanocytarum ex nimio incremento, qui caeruleos ad nigrum mutat in capite, brachiis vel clunibus apparens. Solent esse unici et acquisiti, sed etiam a nativitate praesentes esse et in variis locis apparere possunt. Hae laesiones, saepe confunduntur cum incrementis pigmentatis velut melanomatis obscurioribus, typice apparent in cute, brachiis, dorsis inferioribus vel clunibus.
The term blue nevus describes a group of skin lesions characterized by dermal proliferation of melanocytes presenting as blue to black nodules on the head, extremities, or buttocks. In most cases, they are acquired and present as a solitary lesion but may also be congenital and appear at multiple sites. Blue nevi are melanotic dermal lesions that commonly presents as a blue nodule on the scalp, extremities, sacrococcygeal region, or buttocks. Its characteristic blue to black hue is frequently confused with other darker pigmented lesions, including malignant melanoma.