SynopsisSkin colours are notoriously different between individuals. They are governed by ethnicities and phototypes, and further influenced by a variety of factors including photoexposures and sustained mechanical stress. Indeed, mechanobiology is a feature affecting the epidermal melanization. Highresolution epiluminescence colorimetry helps in deciphering the effects of forces generated by Langer's lines or relaxed skin tension lines on the melanocyte activity. The same procedure shows a prominent laddering pattern of melanization in striae distensae contrasting with the regular honeycomb pattern in the surrounding skin. Ré suméIl existe de grandes différences de couleur de peau selon les individus. Les nuances sont sous la dépendance des caractères ethniques et des phototypes, et elles sont de plus influencées par d'autres facteurs incluant les photoexpositions et les contraintes mécaniques répétées. De fait, la mécanobiologie affecte la mélanisation épidermi-que. La colorimétrie par épiluminescence à haute résolution révèle les effets de forces générées par les lignes de Langer ou les lignes de tension cutanée au repos sur l'activité des mélanocytes. Le même procédé révèle une apparence zébrée dans les vergetures distincte de l'aspect en nid d'abeille dans la peau avoisinante.
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