If you wanted to remove an unwanted blemish from a person's face in a photo, you would use the tool

You can use the tool called "Recovery Brush".

Explanation:

One of the reasons Photoshop is popular today is its digital retouching capability: correcting details of the scene, people, or objects as if the image were naturally so. Using Photoshop you can remove imperfections from photos making them more beautiful, you can even remove blemishes and imperfections from the face of people who are in a photograph. The so-called "Recovery Brush" tool is able to remove imperfections based on other areas of the image, similar to how the Stamp Tool works.

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