I just discover my son (21 months old) has a loose bump under his skin, in his neck. It moves around easily and he didn t like i touched it, but i don t think it hurt. Could this be serious? My son was a preemie of 35 weeks with a string of serious health issues, none related to skin issues, but he has asthma and we suspect Raynaud s disease (runs in the family) due to his blue hands, lips and feet when he is cold. He has a cold right now, but no fever. He gets Ventolin 2 times per day, 4 puffs in total.