I don't have time to type a long answer, ice-boy.
Here's the short answer.

Blue specular (or opposit of Diffuse color) is good, but not the right way. My approach (as implemented in all my good shaders) is to shut down the diffuse when the specular is strong.

Think about why that would be better.

Skin speculars look yellow because you have the orange-pink skin diffuse firing at the same time as the specular, which is white.

How does light really work? This should not be a difficult question as I've written this in detail at least three times.

When a photon arrives at skin, what are its choices?

Can it do all of its choices or just one?

What is the blended value of trillions of photons making a single choice?

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)