The absence of a crescent on the nail is normal because the presence or absence of a crescent and whether it is visible or not is not an indication of the health of the body. The crescent is actually a translucent representation of the nail matrix in the human body, and due to individual differences, some people may have a more pronounced and rosy crescent, while others may have a less pronounced crescent. This is mainly due to some keratin in the nail root area, which may not be visible if it obscures the nail matrix part, and may be more obvious if it is not obviously obscured. However, regardless of the presence or absence of such crescent, it is not an indicator to judge the health of the human body, so treatment is generally not required.