My son complains of several "lumps" on his bicep (upper arm).  He wondered if they could  be lymph nodes. It started this morning with one and now there are several.  They are painful like a swollen lymph node but not under the arm.  He has no history of injury or illness.  No injuries on his arm.      He is wondering if he should get this checked out right away or wait a while.
Respected user, Warm welcome to Chat Doctor.come have evaluated your query in depth.* This seems to be more likely as multiple neurofibromatosis condition, however clinical examination is mandatory to confirm the diagnosis Hope this will clear your query. Regards.