A Rare Case
Doctor here. I used to live in Chicago and noticed that the hands of someone in my building changed in color from white to blue to red, along with pain. I knew immediately what was up, and it was concerning.
This is something called Raynaud’s phenomenon and happens due to excessive vasoconstriction in response to cold or other reasons.
This can be primary in causation with no discernible cause, or secondary and due to connective tissue diseases. I pointed this out to the person, and he got tested and ultimately diagnosed with lupus. Story Credit: Reddit