In this tutorial, I will introduce clone stamp tools, which can be used to clear freckles on faces.
Open a picture first:

Then wheel to enlarge the picture to locate the freckle.

Then choose the clamp stamp tool from side bar:

Press Ctrl+Left Mouse Button to set the source:

Then, paint on the freckle, the result is:

To see what we've done:

It's powerful and easy to use, right?
Some tips:
You can change the radius of the clone stamp brush from the toolbar, or use Shift + Wheel,;
You can change the opacity from the toolbar;
