For a scar that crosses the melolabial fold (black line) in an undesirable perpendicular fashion, there are two ways that the Z-plasty could be performed to change the scar direction (represented by the green and red inks in Figures 4(a) and 4(c)). Although both options will change the scar direction to match the melolabial fold, only one of the designs (green ink Figure 4(b)) allows for the limbs of the Z-plasty to align with the RSTLs of the cheek and lip. Conversely, in Figure 4(d) even though the mirror image also realigns the central limb appropriately, the resultant lateral limbs cross the RSTL of the lip and cheek in an undesirable perpendicular fashion.