Tutorials mainly use the neat image filter to grind the skin, this filter will maintain the skin at the same time the details, but when setting parameters must control the value, try to set the parameters, until they are satisfied. No such filter can be downloaded online.
Photoshop Tutorial Artwork
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1, open the original image, copy a layer. Using the neat image filter to grind the skin, the parameters are set as shown below.
2, with the stamp tool, repair brush tool to repair the remaining acne, and then add a layer mask, with a black brush hair, eyes, eyebrows, lips, these do not need to grind the skin parts.