I have Raynaud's...do this to see if you have it as well:
standing more or less at attention, hang your hands at your sides for about two minutes. If you have Raynaud's they will change color, to either a spotty looking purple and pink or all pink. Also, if you are warm, the fingers and feet swell noticeably with Raynaud's. Mild cases might include rosacea, a pink, ruddy tone to the cheeks; more severe cases might include heart trouble or may be part of heart trouble.
Smokers such as myself increase their Raynaud's reactions to temperature changes. It's not something 'curable'; precautions to protect the hands and feet and medications for Rosacea is all that can be done. But it is fun at parties, etc. "Watch me change color right before your eyes!"
And in High School, kids would ask me to show my hands to see how cold it was-really cold weather would make them look like the surface of Jupiter