07/28/2026
Why is it called a blue nevus? đ
No, itâs not called blue because itâs feeling lonely! đ
A blue nevus gets its characteristic color because of where the pigment-producing cells (melanocytes) are located within the skin. In a blue nevus, these cells are found deep in the dermis. As light passes through the skin, the deeper melanin appears blue rather than brownâa phenomenon known as the Tyndall effect.
In contrast, the melanocytes in most common moles (nevi) are located more superficially, which is why they appear brown.
Blue nevi are benign lesions and, in most cases, do not require treatment. However, they should always be assessed carefully with dermoscopy to confirm the diagnosis and distinguish them from other pigmented lesions, including melanoma, which can occasionally mimic their appearance.
đ Every pigmented lesion deserves a thoughtful evaluationânot every blue spot is a blue nevus.
Pourquoi lâappelle-t-on un nĂŠvus bleu? đ
Non, ce nâest pas parce quâil est triste dâĂȘtre seul! đ
Un nĂŠvus bleu tire sa couleur caractĂ©ristique de la profondeur Ă laquelle se trouvent les mĂ©lanocytes, les cellules qui produisent le pigment. Dans un nĂŠvus bleu, ces cellules sont situĂ©es dans le derme profond. Lorsque la lumiĂšre traverse la peau, la mĂ©lanine situĂ©e en profondeur apparaĂźt bleue plutĂŽt que brune. Ce phĂ©nomĂšne est connu sous le nom dâeffet Tyndall.
Ă lâinverse, les mĂ©lanocytes des nĂŠvus communs sont localisĂ©s plus superficiellement, ce qui explique leur couleur brune.
Les nĂŠvus bleus sont des lĂ©sions totalement bĂ©nignes et, dans la grande majoritĂ© des cas, ne nĂ©cessitent aucun traitement. Toutefois, ils doivent ĂȘtre Ă©valuĂ©s avec soin Ă lâaide de la dermoscopie afin de confirmer le diagnostic et de les distinguer dâautres lĂ©sions pigmentĂ©es, notamment le mĂ©lanome, qui peut parfois leur ressembler.
đ Toute lĂ©sion pigmentĂ©e mĂ©rite une Ă©valuation attentive. Toutes les lĂ©sions bleutĂ©es ne sont pas des nĂŠvus bleus.