<s>[INST] I have many lumps under the skin in my arm up to my armpit, they do not hurt but there are a lot of them. I went to the doctor and they took blood tests and an xray.. I will be getting the results for those soon. But I was just wondering what they could possibly be from. [/INST] Welcome to health care magic. 1.The history suggest - possible cause could be enlarged lymph nodes.2.Lymph nodal enlargement is seen in case of any infection / inflammation , it can be localised or systemic. And lymph nodal pathology itself can cause the pathology.3.In this case an ultrasound examination of the lesions can help to evaluate the nature of the lump and its source, extensions.4.An FNAC - fine needle aspiration cytology for histological evaluation.5.Treat any underlying medical condition if they are any. Good luck.Hope i have answered your query.Any thing to ask do not hesitate. Thank you. </s>