Navel black black can generally use water, soapy water, alcohol cotton to clean, need to pay attention to the action gently, do not cause damage to the skin, induced infection, when anomalies in time to seek medical attention. Navel black black is usually local skin metabolic substances caused by sludge, need to clean up in time. If the amount of sludge is relatively small, and the degree of coagulation of the skin is relatively loose, you can use a cotton swab dipped in water or soapy water, the local skin for cleaning. If the amount of sludge in the navel is relatively large, and the degree of adhesion with the skin is relatively high, in addition to the use of water or soapy water to clean, but also need to use alcohol cotton for soaking, so that the sludge will dissolve, and then use a cotton swab for cleaning. In daily life, the navel and the surrounding skin should be cleaned to avoid infection, and seek medical attention when abnormalities occur.