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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.
Following are some of the causes for finger twitching; 1  Overuse and fatigue of finger is frequently a cause for finger twitching. 2  One or more fingers can be affected at the same time.