Generally speaking, simple surgical treatment will leave traces. If it is surgical combined with non-surgical (laser), or part of non-surgical treatment will not leave scars. For example, laser birthmark removal is an ideal method to remove birthmarks.
It is very good to remove birthmarks by laser, but generally, laser can only remove part of the pigment at a time, because the damaged pigment is three-dimensionally distributed in the skin. To achieve the ideal effect, it usually takes 3-5 treatments, and the interval between treatments needs more than 3 months. This is because it is a slow biological process for the body to swallow and remove the broken pigment, which usually takes 1~3 months. If you don't consider the endurance of the skin, it is very likely that you will leave a scar if you want to remove the birthmark at one time. Don't worry about leaving a scar.
Actually, you don't have to worry about the scar problem, because the laser also has the ability to remove the scar. If there is a scar after the mole removal, you can use the laser to remove the scar. Of course, this requires that the scar is not very serious.