The vesicle cluster visible on the corner of this patient's vermilion border is also referred to as a cold sore or fever blister. The clinical diagnosis is

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The clinical diagnosis for the patient in these photographs is herpes labialis. Primary herpes is not referred to as a cold sore or fever blister, and vesicle clusters are more prominent. An aphthous ulcer does not appear as a vesicle and is not referred to as a cold sore or fever blister. Herpetic whitlow occurs on the finger and is not referred to as a cold sore or fever blister.

The Vesicle Cluster Visible on the Corner of This Patient's