Peritoneal serous papillary carcinoma (PSPC) is a rare disease that arises in the peritoneal lining of the abdomen and pelvis, without a discriminative primary tumor site. We are presenting the case of a 72 year old woman diagnosed with PSPC status postdebulking operation in 2017. This year, she experienced left sided abdominal pain and had a fever for 2 days. After the series of examinations, an unusual complication of a subcutaneous abscess in the anterior abdomen and chest wall was suspected. We searched for any complications of PSPC; however, subcutaneous emphysema and abscess formation over the chest wall and abdominal wall have not been reported to date. The final diagnosis was carcinomatosis, which invaded and perforated the abdominal wall with tumor necrosis or abscess formation.