a hand with raynaud's syndrome symptoms on fingertips. peripheral cyanosis shown as white and discoloured fingers.

skin fingertips hand tips fingers blood circulation disorder syndrome chilly coldness raynauds raynaud hands extreme freezing frostbite frostburn frostnip mountain shivering prevention artery hypotension hypovolemic insufficiency problem shock vascular venous damage disease health cold finger white blue hypothermia frost phenomenon discolored medical symptom day international support swelling