A 28 yo woman presents with c/o dyspareunia. She has been having dysmenorrhea for the past 1 year, & the pain has increased lately. She has some vaginal discharge which is not foul smelling or associated with pruritus. She also c/o becoming irritable during her periods in the past few months. Speculum examination reveals the presence of blue nodules in the vagina.
What is the most likely diagnosis?
A. Bacterial vaginosis
B. Pelvic inflammatory disease
C. Endometriosis
D. Vulvovaginitis