Final answer:
A painful, recurrent vesicular eruption of mucocutaneous surfaces is typically caused by herpes simplex virus (HSV), especially HSV-1.
Step-by-step explanation:
A painful, recurrent vesicular eruption of mucocutaneous surfaces is typically caused by herpes simplex virus (HSV). HSV, especially HSV-1, commonly manifests as cold sores or fever blisters on or around the lips. The virus can be highly contagious, and recurrence can be triggered by stress or environmental conditions affecting the skin.