Nevus

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A nevus is a general term that refers to a number of different, usually benign, pigmented lesions of the skin.

melanocytic nevus: Nevus cells (melanocytes) are normally localized in the basal layer of the epidermis. Their proliferation may appear in the epidermis (jonctional nevus), in the epidermis and dermis (compound nevus) or only in the dermis (intradermal nevus). Intradermal melanocytic nevus – a benign tumor in which the tumor cells form nests in the dermis, are regular and round, their cells having a central nucleus and single nucleolus. Some melanocytes may present melanin pigment in the cytoplasm (dark-brown, granular). Photo: Atlas of Pathology
dysplastic nevus
blue nevus