Eponyms, Morphology, and Pathogenesis of Some Less Mentioned Types of Melanocytic Nevi

Abstract

Some types of melanocytic nevi are seldom mentioned in the literature and are therefore less well known. In the current study, we focus on the concepts of eponyms, synonyms, clinical presentation, and morphology of the following types: Meyerson nevus, cockarde (or cockade) nevus, Hori nevus, Sun nevus, Hidanos nevus, Duperrat nevus, Spark nevus, nevus spilus, eclipse nevus, Kerl nevus, and Kopf nevus.

Dermoscopy of Nevus Spilus

“…Nevus spilus (NS) is clinically characterised by multiple pigmented macules or papules within a pigmented patch. It is called various names: NS, speckled lentiginous nevus, spots on a spot, and zosteriform lentiginous nevus . It may be congenital or acquired.…”

Multiple Eclipse Naevi on Scalp of a Child: Awareness Can Prevent Unnecessary Surgery

“…The term "eclipse naevus" was firstly described in 2001 by Schaffer et al as "a type of melanocytic naevus that is two-tone and has an irregular outline, but is benign" (3). Eclipse naevus is mostly observed in adults in third decades (2). However it has also been described on the scalp of children (2,4).…”

“…Eclipse naevus is mostly observed in adults in third decades (2). However it has also been described on the scalp of children (2,4). In a study evaluating 88 scalp naevi of 39 children, the main clinical patterns included eclipse (n=18), cockade (n=3), solid brown (n=42) and solid pink (n=25) naevi (4).…”

“…Eclipse naevus is a type of signature naevus and it is clinically characterized by a tan center and a brown peripheral rim (1). Although it is mostly seen on the trunk of adults, this type of naevus has also been described on the scalp of children (2). Because eclipse naevi can have some of the ABCDE (asymmetry, border irregularity, color variegation, diameter ≥6 mm, and/ or evolution) criteria for melanoma, removal might be recommended, however they are actually benign and they only need observation.…”

Symmetrical hyperpigmentation of the forehead in a 37‐year‐old female patient from Guinea, West Africa

“…Ursächlich sind vermutlich seit Geburt vorhandene ektope, inaktive und wenig pigmentierte dermale Melanozyten [ 6 ] . Zur Ausbildung von Hori-Flecken kommt es nach Aktivierung dieser Melanozyten durch UV-Exposition, Hormone und andere Auslöser wie zum Beispiel chronische Entzündungen bei atopischer Dermatitis [ 7 ] oder Verletzungen [ 6,8 ] .…”