 Morbid obesity has been increasing in Brazil and the world and bariatric surgery is the most effective and long-lasting treatment. This leads to large weight losses leading to large body deformities due to excess skin and subcutaneous tissue. The most common post-bariatric plastic surgery is post-bariatric abdominoplasty which main complication is seroma. PURPOSE: To evaluate the effect of Scarpa fascia preservation in seroma reduction. METHODS: A total of 46 patients were randomly assigned to two groups. One group will have the Fascia Scarpa removed and in the other the Fascia Scarpa will be preserved. The drains will be removed when the volume is less than 30 ml in 24 hours. The primary outcome will be the volume of total drainage obtained in the drains of the abdominal region. Secondary outcomes will be the length of time the drains remain and the presence of seroma assessed by ultrasound on the twentieth postoperative day. 