The causes for a dark skin or complexion could be many. Some of the most common ones are – Heredity – People who have a dark skin often have children who are dark-skinned too. The genes seem to pass on from generation to generation.
Hyper pigmentation – In this condition the skin produces too much of the pigment melanin, causing the skin to become darker than usual.
Skin disorders – Conditions such as Lichen Simplex Chronicus is a skin disorder that causes severe itching that leaves the skin thick, dark and patchy.
Sun …

If you have a dark skin stick to warm, earthy colors. Gold, bronze and maroon are in fact best for dusky skins. Cooler colors like mauve, pink and silver look better on fairer skins.
Choose lipsticks with matte finish rather than frosted ones. The shades should not be too dark or too light. Medium dull shades would look best. Bright pinks or reds are an absolutely NO! If you have dark lips, before applying lipstick, put some foundation and powder on your lips.
Your blusher too should not be pinkish. Peachish blushers …

Today, there are an increasing number of products specially formulated for dark skins. Dark skins either have a reddish or a yellowish tone. It is important to find the right base to even out the skin tone.
Just as it is a must to use a concealer foundation and face powder for fair skin, so it is for dark skins. Use your concealer before the foundation and choose your foundation in the shades of light, medium and dark to match the skin tone. Keep the application of powder light, dark skins …