Endometriosis is presence of functioning endometrial tissue outside the uterine cavity. Endometriosis can sometimes occur in a previous surgical scar. Scar endometriosis is rare and difficult to diagnose. It mostly follows obstetrical and gynecological surgeries. This condition is often confused with other surgical conditions. Diagnosis is confirmed on histopathology. We are reporting a case of scar endometriosis following caesarean section, which presented nearly 4 years after the caesarean section. Treatment was done by wide surgical excision of the lesion. The pathogenesis, diagnosis and treatment of this condition are being discussed.