Q. A 28-year-old woman comes to the physician’s office for fever and vulvar pain for the past 3 days. She says that the symptoms started with a small painful swelling over the vulva and later it worsened. The pain is so severe that she is hesitant to walk. She doesn’t have any abnormal vaginal discharge, dysuria, or vaginal bleeding. She is sexually active with her husband. Her menstrual cycles are regular. Her temperature is 102°F (38.8°C), pulse is 90/min, blood pressure is 110/80 mmHg, and respirations are 14/min. Physical examination shows a tender fluctuant erythematous swelling measuring >4 cm at the 8 o’clock position within the vulvar vestibular region. What is the most likely diagnosis for this patient based on her clinical features?