the area around and including the elbow is swollen huge and the redness keeps progressing down and up the arm. He was told he had an aggresive infection, no spider bite, but the antibiotic, Bactrin, didn't phase it. 5 days later, he returns, and they put him on another antibiotic, the strongest he was told, and are sending him to a joint specialist, and he is concerned it could be cancer, any insight would help