Brush/Retouch
 
 

Finetune parts of the texture with the Retouch tool.

Use the Brush panel to load the brush shape and to define Size, Hardness, Step-Size and Distraction of the brush. Enable the Spray switch to draw without having to move the mouse.

Select the way of retouching at the Retouch panel. You can choose from modes like Lighten, Darken, Sharpen and others.
The Amplify Value controls the strength of the retouch effect.