A bulge in the lower abdomen of men may be caused by physiological obesity, folliculitis, boils, abdominal lumps and other factors. 1. Physiological obesity: usually do not pay attention to diet, often overeating, intake of high-fat greasy food, long time sitting after eating, the accumulation of abdominal fat, resulting in the lower abdomen raised a bag. 2. Folliculitis: not pay attention to local cleanliness and hygiene, the stimulation of sweat leads to itchy skin, if you often scratch with your hands, skin breakage leads to germs to take advantage of the situation, resulting in inflammation of the hair follicles, which can form a small raised bag, accompanied by redness, swelling and heat pain. 3. Boils: Bacterial invasion of hair follicles and surrounding tissues can cause suppurative inflammation, resulting in localized boils, which are also the main cause of a raised bump on the lower abdomen. 4. Abdominal lumps: A bump on the lower abdomen is also important to understand if it is related to localized lumps, such as lipomas and intestinal tumors, which may lead to a small abdominal bulge. It is recommended to go to the hospital for examination to clarify the cause of the localized mass and then treat the cause.