**4.2 Blue finger syndrome**

It is a sudden cutaneous manifestation in which the fingers, especially the toe, develop cyanotic and painful character. The priority etiology is embolic, but there may be other causes such as rheumatologic and neoplastic, among others. Treatment for this condition depends on the treatment of the underlying disease. However, general and local care such as limb warm-up, physical protection, treatment of secondary infections are essential [32].
