Question: My son, 35 years old, has subcutaneous B cell lymphoma. He also has had ongoing infections in his mouth, sinuses. He had molar removed and biopsy indicated "dental granuloma." His infectious disease physician has had him on 4,000 mg of penicillin/day for two to three months to treat the mysterious infection. When my son tried to stop taking the penicillin twice during that time, he immediately felt fatigued, lost weight, and the rash from his subcutaneous B cell lymphoma spread. Although he has been told by several doctors that there is no correlation between the infection and the lymphoma, he questions that conclusion. Diagnosis and proper treatment of infection has been elusive. He has oncologist, hematologist and radiologist for treatment of lymphoma; ENT for sinus issues; opthamologist for eye issues. He also has seen dental pathologist (dentist/medical doctor), oral surgeon, endodontist. They all consult but no one can find source of infection. Any suggestions?