My daughter is 15, her lymph nodes have been swollen for 5 months. We went to the doctor, he said try a warm wash cloth. Recently she discover a hard marble sized not on the back left upper side of her neck. We went back to her doctor, he gave her amox 500mg for 3 times a day, for 7 days. She took them, the lymph nodes are still swollen. I'm thinking lymphoma of the neck? Helpful answers, opinions are GREATLY appreciated!