Eugenio Pignataro added procedural pores and shared the nodes.
Eugenio Pignataro, the creator of the Oscurart Tools add-on, has shared a free procedural skin shader for Blender and briefly explained how it was made.
In this thread, Pignataro guides all interested through the creation process. You can also find the node tree here.
Aside from this realistic skin, you can see more great projects on the artist's Twitter.