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Development of extensive flat warts after pulsed dye laser treatment of a port-wine stain.

Flat warts (verruca plana) are a common cutaneous infection. They are more common in children than adults, tend to be multiple and grouped, appear within sites of skin trauma, and are more often found on sun-exposed areas such as the face, neck, and extremities. We report a case of extensive flat warts developing within a few weeks of a pulsed dye laser treatment, which seems both temporally and anatomically related. To our knowledge, development of flat warts after laser therapy has not been previously reported.