A bulge in the right lower abdomen without pain, the possible clinical causes are fecal accumulation in the rectum, lipoma, subcutaneous fibroids and so on. 1. Fecal matter accumulates in the rectum: part of the population due to their own water intake is too small or intake of low-fiber diet and other factors, will lead to intestinal dysfunction, gastrointestinal peristalsis slows down, thus making the stool in the rectum dry knot and discharged poorly. If people with the disease are thin and weak, they may touch the swelling in the abdomen. 2. Lipoma: this refers to the tumor of normal fat-like tissue, which is related to genetic, abnormal fat metabolism and other factors, and it is preferred in the tissues with rich fat distribution, and the clinical manifestation is a painless lump. 3. Subcutaneous fibroma: this refers to benign tumors occurring in the subcutaneous fibrous tissue, its position is more fixed and can be pushed, elastic, but not accompanied by pain.