Biomechanical Properties of the Skin on the Dorsal Trunk in Young Men

The skin is the largest organ in the body; the area of the adult skin is approximately 1.6‒1.9 m [1]. The skin is located in the outermost of the body, and it serves as the boundary between the lateral side and inside. Therefore, the skin protects and helps keep humans healthy by guarding the whole body against external mechanical stress, maintaining body fluid balance, regulating body temperature, and sensing organs and immune functions. Protection against external mechanical stress is done by the reversible deformation mechanism in response to mechanical stimuli such as stretching and compression stress [2]. This mechanism is performed by skin elasticity. The skin can be stretched way above its original size. It can return to its original size, maintaining its original physical properties after being stretched [3‒5]. The elasticity of the skin is an important factor in normal joint movement. Therefore, reduced elasticity and extensibility of the skin under pathological conditions is likely to result in limited range of motion. Keloid 【Transaction】