I will add layer mask to face layer because I need erase hair. Choose Brush tool and paint with black on the white layer mask which you have added. If you are done you can apply this mask (right click on mask in layer menu and choose apply layer mask).
You can desaturate face a bit. Click on this icon under layers menu and select Hue/Saturation and move with saturation slider a bit to left.
Choose Mixer Brush tool
Clean skin with this tool. You can use settings like me(in red square). This tool is mixing the nearest colors.









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