Carcinoma of vagina in a case of uterovaginal (UV) prolapse is very rare. We hereby present a case of 72-year-old woman with uterine prolapse with ulcerative growth of 4 cm × 2 cm on vagina commonly considered as decubitus ulcer. However, for confirmation, punch biopsy was performed, which confirmed it as vaginal carcinoma. The patient underwent vaginal hysterectomy with colpoperineorrhaphy with wide excision of tumor margin and received radiotherapy postoperatively. This case illustrates the importance of biopsy of an ulcer in cases of UV prolapse to rule out malignancy to avoid incomplete treatment.