another way to do it, is avoid using colored textures at all, just greyscale maps
almost all shading work i ever do is with greyscale maps, usually being used as a multiplier to whatever color i choose, which has the added benefit of allowing limitless skin colors, rather than being bound by only a very small range near the color of the texture

another added benefit is it saves memory used by texture maps, since most skin keeps the same ratio in colors, (ie 200R/100G/100B vs 250R/125G/125B, why not drop the last 2 channels G and B, since we know they'll be 1/2 of R?) so leaves 2/3 of the texture file to be replaced by bump, spec, or something else, then have 1 of the values used to control each thing in shader room, one of many ways to use texture maps to store more useful info :)