A 10-year-old girl presents with multiple pigmented macules on the vermilion border of her lower lip. The dark brown lesions are 2–5 mm in size and are arranged in a cluster. The patient’s older brother has similar lesions. The patient complains of recurrent bouts of abdominal pain.
Which of the following is the most likely diagnosis?
a. Gardner syndrome
b. Herpes simplex virus infection
d. Peutz-Jeghers syndrome
e. Hand-foot-and-mouth disease
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