A 6-week-old girl is brought to clinic for a rapidly enlarging skin lesion on her left cheek. She was born at term without complications, and the lesion was not apparent at birth but became noticeable at 2 weeks of age. Exam shows a 2.5-cm raised, well-demarcated, bright red plaque on the left cheek. Over the last 2 weeks, it has increased in size and now partially occludes the left eye, interfering with vision. The infant is otherwise well-appearing and afebrile. Which of the following is the most appropriate management at this time?