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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.
Small fluid-filled blisters called vesicles appear on the fingers, hands, and feet. They are most common along the edges of the fingers, toes, palms, and soles. These blisters can be very itchy. They also cause scaly patches of skin that flake or get red, cracked, and painful. Scratching leads to skin changes and skin thickening.