Hidradenitis suppurativa

A 26-year-old man comes to the clinic because of pain and purulent drainage from his left inner buttox. He has had this issue intermittently for the past 10 years, and is afraid that the lesions will lead to scarring. The patient states that he has had the same problem in his axillary region. His current medications include atorvastatin and lisinopril. He is 173 cm (5 ft 8 in) tall, weighs 105-kg (231-lb); BMI is 35.1 kg/m². His temperature is 37.2°C (99.0°F), pulse is 86/min, respirations are 12/min, and blood pressure is 128/80 mm Hg. Physical examination shows erythema, swelling and multiple pus discharging sinus tract openings on the inner portion of his left thigh. Examination of his axillae show the presence of linear scarring bilaterally from prior lesions. Which of the following is the most likely diagnosis?