Thanks for posting your query.
Lump in lower abdomen with dull pain may arise from following organs: female genital tract means ovary and uterus
, large intestine, small intestine
Do you have watery shit/ constipation/ bleeding per rectum/ any menstrual irregularities/ abdominal distension after eating meals?
You should go for ultrasound
imaging of abdomen on urgent basis.
You should also consult with gynecologist and physician and should take proper treatment before problem becomes great.
Dr. Mayank Bhargava