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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.
The following medical conditions are some of the possible causes of Clubbed fingers. There are likely to be other possible causes, so ask your doctor about your symptoms. 1  Bronchial carcinoma. 2  Cyanotic congenital heart disease (see Cyanosis)  Infective endocarditis.