Tools like the Spot Healing Brush let you cover up blemishes or irregularities.
Tools in Photoshop apply permanent effects to the pixels of your image. However, if you use tools on a duplicate layer, you can always undo your change. Tools like the Spot Healing Brush let you cover up blemishes or irregularities. You can paint on an image with the Brush tools as if they were physical paint brushes. Take some time to get to know them.