A 14-Year-Old Girl Is Brought to the Office for Evaluation

A 14-year-old girl is brought to the office for evaluation of a bump on her chest just below the right breast.  The bump has been there for as long as she can remember, but it became a little larger 2-3 years ago.  The bump also becomes tender just before she starts her menses.  Menarche was at age 12.  Her menses occur every 28 days and last 4-5 days.  Examination shows Tanner stage 5 breasts.  Both breasts and axillae appear normal.  There is a soft, raised, hyperpigmented, 0.5-cm nontender lesion inferior to the right breast.  Which of the following is the cause of this patient's presentation?

A) Clonal proliferation of benign melanocytes
B) Excessive sunlight exposure
C) Failed involution of the mammary ridge
D) Fat cells in a fibrous capsule
E) Pedunculated outgrowth of normal skin

Correct Answer:

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