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Doesn't sound like Raynaud's syndrome to me either. Every case I have seen has a distinct color change during the onset of the vasoconstriction. Doesn't have to involve all the fingers or even the full length of the finger, but its presence is obvious when you see it. Doesn't mean it isn't a possibility for your presentation, but I would investigate other causes first.
I like the thought process of food/dermal allergies. Normal allergy testing (pin prick type ) will not always identify the etiology. Contact (patch) testing will, however, sometimes reveal the culprit. In my daughter's case, it turned out to be cobalt metal. We removed most legumes (beans, chocolate, etc) from her diet and got rid of cheap jewelry that contains it and VOILA! For several years we had been down the steroid creams for acute use, oral steroid meds for extreme outbreaks, cetaphil, aquawhatever, and EVERY other OTC lotion known to man on a twice daily basis. haha While the steroids worked temporarily, the problem would always reoccur. The normal allergy testing showed no allergies. Finally, we found a different dermatologist that prescribed the patch testing.
Now, we don't have to use any lotions unless I let her eat chocolate or bean burritos as a treat. Hopefully, your dilemma will have as easy of a "cure".
Good luck.
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