When minifigures first came out, yellow was the obvious color to use for hands and heads. Flesh tone colored plastic was not available from TLG. Since then some cartoons used the same color scheme, such as the TV series "The Simpsons", everybody thought "that's cool, it's like TLG". Now TLG uses more realistic flesh tones when necessary, such as "StarWars". "Star Wars" Lego sets were still yellow for quite a few years before going with flesh tones. It's good the way it is . Leave it alone.