Yep, here's the official word:
PENTAX K-1 | FAQ | Support | RICOH IMAGING Quote: Q. What is the [Skin Tone Correction] function?
A. The Skin Tone correction function restores a tender texture and a healthy tone of the subject’s skin, while keeping the high-resolution rendition in its hair and clothing and in the background.
*The Skin Tone Correction function can be activated and effective when the face is detected in the captured image regardless which AF mode or Exposure mode is selected.
* The Skin Tone Correction function can be selected at RAW development in K-1.
At the Capture menu 3, you can select from TYPE1, TYPE2 or OFF.
-TYPE1: Correct color and brightness of skin.
-TYPE2: Addition to TYPE1, make smoother skin.