A 33-year-old female had a sudden left vulva pain for 2 days, accompanied by fever and systemic weakness. Physical examination showed that local swelling, heat and pain existed at the lower lip of the left vulva major and in front of the vaginal opening, and there was a sense of fluctuation in touch. Combined with the history and other signs, the diagnosis is most likely to be A: Acute cystitis B: Acute urethritis C: Nymphitis D: Acute vestibular great adenitis