Brief Answer: Its to cold induced vasoconstriction Detailed Answer: Hi Welcome to Healthcare-Magic Greetings of the day, Dear Ms, I would first and foremost like to reassure that its a perfectly normal body behavior , as a protective response on exposure to extreme of temperature like cold. When body is exposed to cold weather like the typical dry cold you were exposed, the body tries to conserve heat by reducing blood flow to surface of body through which heat loss occurs. It is affected by causing vasoconstriction( closing of arteriole : the tiny blood vessel supplying blood to skin especially the extremities of body like hand and feet which are directly exposed to cold). This reduced blood supply causes the colour change, as also the blood supply to free nerve endings supplying the skin is affected it causes numbness. I would advise you to wear appropriate protective clothing which will take care and prevent it. As you had atrial fibrillation, if the colour change does not revert back to normal when the cold exposure ceases then possibility of embolism to fingers is to be considered. As the colour change has reversed back to normal and you no longer have numbness there seems to be no cause for concern. Wishing you a happy and healthy life. Do get back to me if you need any further assistance, will be glad to assist you. Take Care Best Regards Dr Deepak Kishore MBBS,MS,MCH Consultant Surgeon

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Brief Answer: It's the difference between room and outside temp Detailed Answer: Hi If the difference in room temperature and outside temperature is high,exposure to this can also induce vasospasm. As previously mentioned by you that the colour returned back to normal then there is no cause for concern. Rest be assured. Take care Best Regards Dr Deepak

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