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Blisters (finger): There are almost limitless causes of blisters on the finger. Course contact dermatitis is the most obvious cause especially if you have any rash anywhere else, but there are such strange things is herpes zoster appearing first i'm just a single finger, which we've seen many times.
This can happen when you are outside in extreme temperatures without gloves, or when you hold onto something cold, such an iced beverage. However, fingers that turn white and go numb may also be a result of a condition called Raynaud's Syndrome. Another phenomenon that can cause whiteness and numbness is Vibration-Induced White Finger (VWF). It's similar to Raynaud's, but VWF is caused by using vibrating hand tools, like jackhammers.