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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.
A swollen finger can occur due to many reasons, 1  Cause for swollen finger includes injury, infection, repetitive motion and broken finger. 2  Nail biting also causes serious infections. 3  Paronychia is another condition where pus is formed below the nail and skin leading to a inflammation and redness around the area.