Striae distensae represent a common skin condition, corresponding to a physiological event particularly developed during adolescence, pregnancy and gain in body weight. In addition, these lesions are induced by the Cushing syndrome or an intense corticotherapy. The viscoelastic properties of the skin are altered and vary according to the severity of striae distensae. Otherwise, the colours of striae distensae vary with time in response to the mechanobiology of blood vessels and melanocytes.