My 13 year old son suddenly developed swelling, redness and pain at the base of his right big toe/ball of foot. This happened about 4 hours ago. He was fine all morning, then suddenly felt it. At first we thought it might be a spider bite, but there are no signs of a puncture site. He has bronchitis at the moment and has been taking mucinex for a couple days. We just saw doctor this morning and received antibiotics for bronchitis; however, the pain/swelling in his foot did not start until after we got home and before he took antibiotics. Thank you for any advice, Steve