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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.
Lip blisters are caused by herpes simplex virus HSV-1. It may occur due to emotional stress or trauma on the lips or due to prolonged exposure to sunlight. Sometimes it may infect your eyes, fingers and even genitals.