Shingles or Something Else? Small blisters that appear only on the lips or around the mouth may be cold sores, sometimes called fever blisters. They're not shingles, but are instead caused by the herpes simplex virus. Itchy blisters that appear after hiking, gardening, or spending time outdoors could be a reaction to poison ivy, oak, or sumac. If you aren't sure what's causing your rash, see your health care provider.
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