<s>[INST] Hi there, We found a lump on our 9 month old sons left shoulder and in his left arm pit . The peads dr gave him an ultra sound and did bloods. all came bk normal and were told its a re-action from the bcg. But we still have concerns and still worrying could you please explain in detail. Tld it was his lyphnoids were up. As you can imagine the first thing you think is cancer. Please can you set our minds at rest. Your information would really help A scared parent regards Kelly [/INST] Hi. Its not a cancer in first place. Its infection which causes enlargement of lymph nodes specially in babies. It will advisable to give a course of broad spectrum antibiotic like cephalexin or augmenting or cloxacillin in appropriate doses. If the swelling decreases in size, it rules out cancer. Also, if it persist, please get a biopsy done and go for further investigations. </s>