My 22 momth old som has a lump on his head, right behind the left ear. it is the size of a chick pea or slightly larger. we discovered it last evening while bathing him. he is a normal, happy and otherwise healthy boy. we had his vaccinations for 12 months and 18 months last tuesday- i held off on vaccinating him at 12 months as there is so much controversy on wether to vacvinate. I did research and ultimately decided to vaccinate him. he did not exhibit any adverse reactions at the time, other than pain at the 5 injection sites. but last nite, like i memtioned, we noticed this lump. and now tonight, he had a fever of 102 degrees F. I am not sure if the lump and fever arescomnected, or, or it is the vaccinations working in his body. the vaccinations nurse noted he could have a fever even 7-21 days after the vaccinations. so i am not sure