Proper use of lighting is where you can make the most impact on the quality of your subject's skin. Using a large light source, such as an umbrella or softbox a little above and just to the left or right of the subject-to-lens axis. Called "broad" lighting, this technique will dramatically reduce apparent skin blemishes, but unfortunately, it's not too interesting.
The further left or right you move your main light the more you will emphasize skin texture. To create a minimal amount of depth you may find this is necessary. Just be sure to use a fill light (usually about half the power of the key) that is very close to your camera lens. Remember, to ensure your fill light doesn't introduce unwanted shadows, be sure to use a light at least as large (preferably larger) than your main light.
This may be obvious, but it bears mentioning. Extreme close-ups turn even perfectly perfect skin into moonscapes. Be careful and just remember that you always can simply backup or zoom out.
Of course, some people with skin blemishes resulting from acne, sun exposure, or accidents may be intensely sensitive to their condition. It's possible they may either be offended by attempts to make them look different than they are or they may be relieved that you are willing to make them look their best. But having these tools at the ready will give you the ability to make that choice.
Brian Peterson is Videomaker's Editor in Chief.
3 Point Lighting
Basic Shooting (DVD)
Light it Right (DVD)
Advanced Shooting (DVD)
Three-Point Lighting 101
Composition 101
Depth of Field
Producing a Documentary Part 2
How Did They Do That?
Lighting Technology