The black hard matter in the belly button does not necessarily need to be cleaned up, it should be clear what the black hard matter in the belly button is, and then determine whether it needs to be cleaned up. The black hard matter in the belly button of the newborn does not need to be cleaned, can be metabolized, other people in the belly button black hard matter may need to be cleaned, may not need to be cleaned, if accompanied by redness, swelling, pain will need medical treatment. 1, umbilical cord blood scab: belly button is the umbilical cord connection in infancy, connected to the placenta, the umbilical cord will be cut and ligated at birth to form the belly button, so the hard matter in the belly button of the newborn may be blood coagulation crust, usually There is no need to clean it. Keep the local clean, follow the doctor’s instructions to disinfect regularly with iodine volts, after a period of time can fall off on their own; 2, trauma blood scab: If it is due to trauma, the blood scab in the navel formed black hard, can wait for its own fall off, if the black hard with redness, swelling, heat and pain, or even purulent discharge, may have been infected navel, at this time is strictly prohibited self-diagnosis, scratching. It is recommended to seek medical attention in a timely manner to avoid serious infection and other symptoms or systemic reactions, bringing unnecessary trouble to the health of the body; 3, metabolic keratin: the navel contains sebaceous glands and sweat glands, can secrete oil, sweat, mixed with the human skin metabolism of old keratin, as well as the dust in the outside air, the formation of black hard material gathered in the navel. Some people have deep belly button, more folds, it is more likely to accumulate dirt, it is recommended to use soapy water to clean the bath, wipe clean with alcohol cotton balls, cleaning force is strictly prohibited, too deep, so as not to cause infection.