Frequency separation
Frequency separation splits your photo into two layers: a low frequency with color and tone, and a high frequency with the fine texture. That lets you fix skin blotches in color without harming the pores, and vice versa. It is the technique for clean, detailed skin retouching.
Make two copies of your layer, blur the lower one with Gaussian Blur for the low frequency and calculate the upper one with Apply Image for the texture. On the low layer you even out color and tone shifts with a soft brush or the clone stamp, on the high layer you fix pores and stray hairs. Keep it subtle, otherwise the skin turns plastic. Tip: for most portraits a mix of dodge & burn and healing is already enough, use frequency separation selectively.
Read also the in-depth explanation: Frequency separation explained.
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