Pelvic effusion 1.3 cm liquid dark area, may be ovulation and other physiological reasons, without treatment, may also be the presence of pelvic inflammatory exudate and other pathological causes, can be treated with drugs, need to be specifically analyzed. 1. Physiological reasons: sometimes there will be pelvic effusion before ovulation or menstruation, at this time there are no special symptoms, the effusion can be self-absorbed, generally without special treatment. 2. Pathological reasons: If the pelvic fluid is accompanied by abdominal pain, lumbago and other discomforts, it is considered to be pelvic inflammatory disease, you can take cephalosporin, penicillin and other drugs for anti-infective treatment, to promote the absorption of fluid. If there is a pelvic effusion 1.3 cm liquid dark area, you need to go to the hospital in time, if you need medication, take it under the guidance of the doctor.