Hypertrophic scars sometimes are difficult to distinguish from keloid scars histologically and biochemically, but unlike keloids, hypertropic scars remain confined to the injury site and often mature and flatten out over time. Hypertrophic scars are more common in people with lighter complexions. The most common locations include chest, back, shoulders, earlobes, the lower face and, in general, any pressure- or movement-dependent areas of your body. Scars from the healing of deep second degree burns and those formed at the fringe of a skin graft are prone to hypertrophy.