The Subsurface Scattering in Principled BSDF is a bit confusing:
- Where can I find some material presets?
- What is the difference between Scattering Color and Radius?
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Values of around 0.01 are normal, since you're scaling from meters to milimeters
Scale the radius down using the Subsurface slider
Link - Henrik Wann Jensen, Stephen R. Marschner, Marc Levoy and Pat Hanrahan: "A Practical Model for Subsurface Light Transport". SIGGRAPH'2001.
An Introduction To Real-Time Subsurface Scattering, Stanford Dragon - Stanford University Computer Graphics Laboratory, Subsurface - Arnold Renderer, Subsurface - Substance Painter, Subsurface - Renderman