My son is 6 years old and about 20kg - he was stung by a bee on his right hand four days back. Two days back, in the evening I noticed that his left gland in the neck was very swollen. He is allergic to bee stings but has never reacted like this. How long before the swelling goes down or before I have to rather take cautionary steps and take him to the doctor. He had no other side effects from the bee sting this time around.