On this advanced video tutorial, image editing specialist Michael Woloszynowicz (from vibrantshot) takes a look at recovering skin texture details from a portrait image using Photoshop.
In some cases we get an image which is properly exposed as a whole but some specific areas are overexposed (typically due to harsh pinpoint lighting or reflections from the skin). In order to effectively recover the skin texture details that were lost in the highlighted areas of your subject while preserving the overall luminosity of the original imagem, Woloszynowicz uses frequency separation.
If you are not familiar with this method, there are several good guides here on LensVid that can help you (here are a few of them). If you are familiar with frequency separation Woloszynowicz goes over the different steps that you will need to use in order to recover the very micro skin details in the blowout areas of the forehead of the model.