A connective tissue disease that may be either primary or secondary to another condition. It is characterized by finger or toe color changes upon exposure to cold (directly or indirectly) in which the digits turn white (and occasionally painful), then turn red, followed by blue. A blue coloration change of the digits alone is termed acrocyanosis and is not Raynaud’s phenomena. If nail fold capillary changes are present with Raynaud’s phenomena, there is concern for the development of an associated connective tissue disease.