SSS is not the issue if we're talking about the surface bumpiness. You want to work with the bump channel.

I usually use the bump image that comes with figures, but sometimes its not enough or not quite right. In my Apollo Max shader, I added procedural pores. These look much more real on the nose and cheek than random bumps do. 

Here's an example - because the skin is so dark, the specular effects on the bumpy skin are really important.

The procedure for making those pores is math intensive and needs a lot of nodes.

Still, a lot can be done with simple shader setups for bumpiness. Here is a completely procedural skin - the color changes with the light because of some nodes that simulate SSS. By the way, SSS in skin is not just about lit-from-behind effects. Even on the front side, there is scattering of light that softens the look. Anyway, this fake skin has a surface bump made from a simple Granite node.

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