The tumor is larger than 2 centimeters at its widest point; or the tumor is any size and has two or more of the following high-risk features: (1) is thicker than 2 millimeters; (2) has spread into the lower layer of the dermis or into the layer of fat below the skin; (3) has grown and spread along nerve pathways; (4) began on an ear or on a lip that has hair on it; or (5) has cells that look very different from normal cells under a microscope.