A 19-year-old woman presents to the gynecology clinic with intermittent vaginal spotting and watery vaginal discharge for the past two months. She denies pelvic pain, fever, or a history of sexually transmitted infections. Her mother took diethylstilbestrol (DES) during pregnancy to prevent miscarriage. On pelvic examination, a 2 cm exophytic, irregular, and friable lesion is observed on the anterior vaginal wall near the cervix. No adnexal masses or lymphadenopathy are found. Histopathology: Cells with glycogen-rich cytoplasm Hobnail cells in a tubular and papillary growth pattern Imaging Findings: MRI of the pelvis confirms a localized lesion in the anterior vaginal wall without extension to adjacent structures or lymph node involvement. Chest CT shows no evidence of distant metastasis. What is the primary treatment for this lesion?