Anyone who takes pictures of people on any kind of regular basis has had to deal with portraits or other photos where the people in them look a little shiny. Maybe they’re a little sweaty, or lighting is to blame, but either way it’s an easy fix in either Photoshop or Lightroom, whichever you use.
Source: LifeHacker – Quickly Fix Shiny Skin in Your Photos Using Photoshop or Lightroom