There are many ways to make skin glow in Photoshop, but one of the quickest and easiest ways is to use the High Pass filter. Simply duplicate your layer, go to Filter > Other > High Pass, and play around with the Radius until you find a look you like. Then set the layer blend mode to Linear Light.
If you want more control over the effect, you can try using a curves adjustment layer. Create a new curves layer and drag the middle of the curve up to lighten the image, then drag the bottom left corner down to darken the shadows. You can also add a levels layer to further refine the effect.
Once you’ve achieved the look you want, simply add a layer mask and paint over any areas where you don’t want the effect to show.
Conclusion: The High Pass filter is one of the quickest and easiest ways to make skin glow in Photoshop. However, for more control over the effect, you can try using a curves or levels adjustment layer. Remember to add a layer mask if you want to selectively apply the effect.