The black dirt in the navel is mostly local metabolic dirt. If the dirt is less, and not adhered to the skin, local cleaning can be; dirt is more, and adhered to the surrounding skin, can be localized after soaking and scrubbing. 1. Less dirt, and not adhered to the skin: cotton balls dipped in water or soapy water, local cleaning can be. 2. More dirt, and with the surrounding skin adhesion: only use cotton balls to wipe may not be able to play a role in cleaning. It is recommended to use 75% alcohol cotton balls or iodine cotton balls, local soaking 5-10 minutes, to be dissolved after the use of dry cotton balls local scrubbing, cleaning effect is better. Cleaning the navel according to the amount of dirt, and the degree of adhesion with the skin, you can choose a different way to clean. Be careful to avoid using hard objects or nails to clean the navel, where the skin mucosa is more fragile, improper force may lead to ulceration, infection. If the patient cleans the navel after redness, swelling, pain and other abnormal manifestations, should be promptly to the regular medical institutions for treatment.