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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.
Something similar to a felon is a herpetic whitlow. Itâs caused by the herpes virus. As with a fever blister and genital herpes, a whitlow is recurrent and tends to cause pain and blisters, run its course, and go away. The finger pad is usually not as swollen as it is with a felon.