There are several ways you can remove blemishes on a portrait photograph and create a more even skin tone
Here we have a portrait shot where we want to remove the blemishes on the forehead.
First I selected the spot healing brush on the left hand side of the toolbar, using this tool you can click on small blemishes which will then disappear.
The second tool you can use to remove blemishes is to use the clone brush, here you select part of the skin which you want the rest to resemble, then you paint over the blemish and they will be replaced with the parts of skin you previously selected
here we have the finished image with all skin blemishes removed