The skin imperfections sliders are used to remove redness and yellow area on the skin, making the skin tone even.
Redness: Amount - Determines how much to change the color of redness area to normal skin tone. Increase the Amount value to make the color closer to normal skin tone. A value of zero (0) turns off changing.
Redness: Brightness - Brighten the redness area to make the skin flatter.
Yellow - Determines how much to change the color of yellow area to normal skin tone. Increase the value to make the color closer to normal skin tone.
Balance - The Balance slider can be used to shift the normal skin tone, use it to decide how much of the image should be redness/yellow. Move the slider to the right will turn the normal skin tone yellow, increasing the redness area and decreasing the yellow area, while to the left will turn the normal skin tone red, decreasing the redness area.