In Raynaud's phenomenon which of the following change is seen in vessels in initial stage?

Raynaud phenomenon results from the exaggerated vasoconstriction of aeries and aerioles in the extremities, paicularly in the fingers and toes. The restricted blood flow induces paroxysmal pallor or cyanosis; involved digits characteristically show " red-white -and-blue " color change most proximal to most distal Robbins 9 th edition page no. 355