Airbrushing
Using the photoshop airbrush tool, with a lowered opacity and changing the blending mode to lighten, darken, screen or multiply, one can acheive a softening result, like it was possible to do with a real airbrush on real pictures. Alt/Option+click often to sample relevant skin colors.
Alternatively, some users prefer the median filter to the gaussian blur, and might do blurring on a copied layer (yes, I know you didn't ask for that), then a mask all, and use any brush tool to paint in the mask to apply softening selectively.
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