A 42-year-old realtor comes to your clinic, complaining of "growths" in her vulvar area. She is currently undergoing a divorce and is convinced she has a sexually transmitted disease. She denies any vaginal discharge or pain with urination. She has had no fever, malaise, or night sweats. On examination you see a woman who is anxious but appears otherwise healthy. Her blood pressure, pulse, and temperature are unremarkable. On visualization of the perineum you see two 2- to 3-mm, round, yellow nodules on the left labia. On palpation they are nontender and quite firm. What diagnosis best fits this description of her examination?