Step 1: Open up your photo into Photoshop.
Step 2: Now just work out exactly what parts you would like to clean up before you start and then select an area and room right into it so you can see each pixel around it.
Step 3: Then click on the Eyedropper Tool in the tool bar or click 'I' on your keyboard and select a pixel that is very close to the spot you should like to clean up. In my case I'm cleaning up the freckle near her eye.
Step 4: Once you have selected a colour, click on the Brush Tool and change the brush thickness to around 6 px and the opacity to 25%.
Note: This opacity and brush size may change with each job.
Step 5: Now just slide the brush over the area you want cleaned up and you will see how the area will disappear and you will get clean smooth feeling on the skin if you select a good colour with the eyedropper and have the write opacity.
Also please remember you may have to go over the spot a couple of times to remove the area but it’s worth it in the end.