<s>[INST] My 4 year old son has been sick with cold like symptoms for a couple weeks now.... nothing serious some sniffles and a cough here and there but then 2 days ago he developed a bad cough and has had a fever ranging from 100-102 we also noticed tonight that he has a HUGE (like a large grape - maybe bigger) lump on the left side of his neck. We couldnt get him into his Doctor yesterday or today but he has an app. for tomorrow... do you think it can wait or should I take him to the ER tonight? [/INST] HI...by what you say I feel that he is having a cervical adenopathy which is very common in cough and cold like this. The high temperature is because of viral illness which is the most common cause of cough and cold in kids. Unless the kid is severely breathless or having extreme pallor or severe pain the neck region at the sites of swelling or redness at the site of swelling which means the lymph node is getting secondarily infected, you need not take him to the emergency room, and you can wait till the pediatricians appointment. Regards -  </s>