There is a black hard lump in the belly button picked out if there is no infection, usually fine. If there is no redness or itching after the patient picks it out, it is usually fine. It is recommended that patients use a clean cotton swab dipped in povidone-iodine to sterilize the navel after picking it out to avoid infection. Black hard lumps in the navel is generally body hair, skin shedding cells, clothing fibers, dust, and sweat and other long time accumulation of the formation of long time is easy to adhere to the skin, if you make a strong picking, easy to damage the local skin, resulting in infection, triggering inflammation of the navel. Therefore, it is not recommended that patients in the navel when there is a foreign body for violent picking out, you can use the right amount of warm water or iodine drops into the navel, soften the hard lumps, and then use a clean cotton swab or tweezers to gently remove the hard lumps. Patients are advised to pay attention to regular cleaning of the navel to avoid accumulation of dirt and reduce bacterial growth.