Human skin is a lot more than that.
In fact, the skin is an organ with multiple functions, just like other complex organs such as the liver, lungs, kidneys and gastrointestinal tract. Also similar to other organs, there are many ways in which one or more of the multiple functions of skin can go wrong and cause disease. Unlike a hot dog skin, human skin has a complex, multi-layered structure. The complex, intricate structure allows the skin to have many complex functions. Multiple functions would not be possible without complex structure.