Respected Sir, hi I evaluated your query thoroughly. It`s called reactionary lymphadenopathy occuring in the drainage area following any bacterial or viral infection of the nearby regions of the body. In our clinics we prescribe cephalosporin group of antibiotics for better, faster resolution of the lymphnode enlargement after thorough clinical evaluation. So though there is no fever or other symptoms , I would suggest you to take him to your family doctor. till then you can follow simple measures at home * maintain his hydration levels. * avoid exposure to excess sunlight. * keep the affected area dry and clean. * prefer to wear cotton loose clothes. * look out regularly for any rise of body temperature. Hope this clears your query. Thanks for using Health care Magic and reading my answer. Regards Wishing your son a fast and speedy recovery from the same. Bye Dear Take care of him.