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Coldness and numbness are caused by constriction of the blood vessels.The discoloration is because less oxygen reaches the skin.It is often associated with diseases that affect the blood vessels (artherosclerosis, rheumatoid Arthritis etc.).Also it can be early stage of Raynaud's Phenomenon(a condition in which bluish discolouration and numbness of fingers appears on exposure of cold).
A physical examination and tests to determine blood flow can identify this condition.So I advice you to make an appointment with your physician.
Hope this helped.