A hernia is a bulge in the skin due to a tear of muscles or tissue. When the person has a muscle tear on a particular area, the internal organ behind that is what protrudes and creates a bulge in the skin. The size of the bulge varies and may occur on the different body parts. The symptoms of a hernia include a lump in the skin that may not be visible depending on its size and location. It may also occur to people who have a history of surgery in a particular area.