All skin must be analyzed carefully before treatments are given. You or your esthetician me be particular careful during the analysis of dark skin, because skin imperfection such as (blemishes, flaws,blackheads, etc.) that are  readily visible on light skin may not be so easy to detect on dark skins due to the dark pigment of the skin. In many cases  most dark skin will be healthy and even in color. The skin will most often have good texture and may only need maintenance treatments.