My son, who is 13, noticed a lump in his groin area two days ago. It is about an inch long and half an inch wide, rather firm and very sensitive to touch. The skin over it appears normal. It hurts him intermittently. It seems likely to be a swollen inguinal lymph node. He has not been sick, nor does he have any apparent cuts on his legs or feet. We saw the doctor yesterday. The doctor recommended an ultrasound. This procedure is scheduled in a few days. Last night, the area above the swollen node began to swell as well. This swelling is not a distinct lump like the original spot, just a swollen area about 2-3 inches long and wide. Today he is complaining of a sore throat. The ultrasound is scheduled for Friday. Is further treatment more urgent given these additional symptoms?