There are a few ways to remove tan lines in Photoshop. The first way is to use the Healing Brush. To use the Healing Brush, click on the brush and then drag it over the tan line. The Healing Brush will automatically fill in any gaps between the skin and the background. The second way is to use a layer mask. To use a layer mask, click on the layer mask icon (the three lines in the bottom-left corner of your screen) and then click on the desired line or area of skin that you want to hide. The third way is to use a gradient tool. To use a gradient tool, click on the Gradient Tool icon (the four lines in the bottom-left corner of your screen) and then drag one of the colors from left to right across one of your skin tones. The fourth way is to use a cloning tool. To clone an object, click on Clone Stamp (the five lines in the bottom-left corner of your screen). Then, select another object and press Ctrl+C (or right-click and choose Copy).