If a newborn's skin jaundice reaches a level of twenty, it is a warning sign that the jaundice is significantly elevated. It is advised to promptly go to the hospital for an examination. If the bilirubin levels in the blood are indeed that high, timely intervention and treatment are necessary. Normally, for physiological jaundice, the levels should not exceed fifteen after seventy-two hours in infants. Even during the peak period of four to five days, it should not surpass fifteen. If the jaundice noticeably increases within the first three days and exceeds twenty, the severity of the jaundice might be worse. The younger the newborn, especially with levels above twenty, the higher the risk of bilirubin entering the brain, potentially leading to bilirubin encephalopathy. Therefore, with jaundice reaching twenty, it is still recommended to promptly go to the hospital for intervention and treatment.