The crescent on the nail is essentially a nail matrix, and the absence of a crescent on the nail in some people is normal and usually has no significant correlation with the state of health of the organism. The crescent on the nail is medically known as the half-moon of the nail, which is the white area near the root of the nail. Since the growth rate of the nail is not uniform, the middle of the nail usually grows faster than the sides, and the unkeratinized nail matrix appears white. The nail half-moon tends to be more pronounced in people with faster growing nails. Different people have different rates of nail growth, etc., and the number and degree of visibility of nail semilunar varies. It is normal for some people to have no visible onychomycetes, which does not mean that there is a health problem. If you are not feeling well, it is recommended that you seek medical attention in time for a standardized examination by a professional doctor.