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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.
Possible Causes. 1  Carpel Tunnel Syndrome â If you have carpel tunnel syndrome, there is a nerve that is nicked in your wrist that passes through your carpel tunnel. 2  This is commonly done to help relieve pressure associated with the median nerve. 3  In doing so, it often leads to twitching of the thumb or index finger. Side Effects â Certain drugs such as diuretics, corticosteroids and estrogen are often causes of twitching in your fingers. 2  Caffeine â It is reported that too much caffeine or withdrawals of caffeine can cause muscle twitching. 3  This includes coffee, soda and chocolate.