Underarm lines are obesity lines, which occur when the ligaments of the skin tissue break down due to rapid weight gain over a period of time. Deep underarm lines can be removed in a variety of ways, such as laser and facelift surgery. 1. Laser: Underarm lines can be removed by laser. Laser is the use of special light waves on the skin, to promote collagen regeneration of the skin, thereby stimulating fiber synthesis, this can effectively remove lines, so that the skin looks particularly flat and smooth. 2. Facelift: A facelift removes unwanted skin folds and makes the skin smooth and wrinkle-free. Deep underarm lines may also be other reasons, such as collagen loss caused by excessive skin laxity, wrinkles, the specific circumstances also need to go to a regular hospital, so that the specialist doctor to determine the appropriate program after an interview, remember that any surgery has risks, to weigh the pros and cons.