OK nerd alert
You have not given us anywhere near enough information to make any suggestions really. what do you mean by white fingers? solid white, blotchy
Raynaud's is episodic, cold induces, circumferential blanching extending from the fingertips proximally. attacks usually last 20minutes. this is followed by progressive rewarming, intense red/purple colour and hot aches.
Non-Freezing cold injury can have colour change, without raynauds, along with sensory loss in the cold and burning pain. Seen in people who were born and/or lived their lives abroad then spend time in the cold and wet. Real problem in the military but we also see it in outdoor workers and possibly in people doing water sports in the winter
perniosis or chilblains is another possibility where the red accentuates the pallor of the other skin.
blotchy blanching lasting a few minutes and associated with tingling is pretty normal and may increase with age. I have noticed it myself for the first time this winter quite a few times after long walks even when not truly frosty.
if it happens again grab some photos. if it resolves too fast to get photos it is not raynauds and almost certainly not something to worry about.