The parents of a 2-month-old boy brought him to the clinic with concern for what they described as “bug bites” on his face. The infant had red blanching papules lateral to his left eye. The lesion had an orange-peel appearance. He was sent home with observation with a suspected diagnosis of insect bite. The infant returned a week later for a well-child check. The parents reported that one red spot had been present on the child’s face for 3 weeks without resolution. They noticed that throughout the day, the lesion sometimes changed in intensity and looked more prominent than at other times. The day before, they had noted a small amount of clear drainage from the lesion. He had been feeding well and was afebrile and without any other lesions or systemic signs of illness. The parents had not applied any creams or tried any other interventions. He was an otherwise healthy, full-term infant who was growing and developing as expected. How would you diagnose this lesion?