Boys have two horizontal lines on the stomach, mostly belong to the growth lines or obesity lines. Growth lines and obesity lines are atrophic lines, are due to the rapid development of the body within a short period of time or rapid increase in body weight, subcutaneous elastic fibers can not keep up with the growth of musculoskeletal growth rate, dermal fracture and atrophy, the formation of different directions of the lines. Atrophic lines at first for the irregular stripes of skin depression, the depression of the skin thinning, the surface of the shiny, the color is mostly light red or purple. After six months to two years, most of them become light traces whose color is close to skin color and may not fade for a long time, while some of them will fade slowly after puberty. If these atrophic lines affect the aesthetics, they can be improved by applying lasers or medications, such as retinoic acid cream, salicylic acid cream, and so on. It is recommended that patients who wish to have treatment go to a regular medical institution.