Visit a nearby departmental store or a cosmetic store that sells makeup foundation. Normally, you will find beauty consultants at the foundation counter who will help you choose the best product. In some cases, you can also try them yourself by using testers available on the shelf.
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Pick up 2 to 3 liquid foundations that appear to be close to your skin tone. Now dab a little drop of the middle shade, among the three, on a clean sponge.
Now apply the foundation on a clean area of your face. It is advised that you should use that on the side of your jaw line. Do not try it on your hand, if the tone is different to the tone of your face.
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After you apply it to your face, see yourself in a mirror and check if the foundation blends in with your face colour. For a true match, make sure you are standing in natural light or in front of the mirror lights. Make sure you do not see any lines or difference in the applied area and the very next part of your face.
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If you find any difference, check another shade at another part of your jaw line and repeat the process. Keep testing different shades and brands until you find the perfect match.