Photoshop Unique Technique TO Remove Acne and Whiten Image

Photo From: deviantart.com
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Process In Short:

STEP 1
1. Invert Photo
2. Select Vivid layer blending on the same layer
3. Apply HighPass
4. Apply Gussian Blur
5. Add a Layer Mask and Invert the Layer Mask
6. Now paint the skin on Layer Mask where it's necessary.

STEP 2
1. Merge Layers now apply Overlay Blending
2. Select Vibrance
3. Adjust Vibrance as your requirement