<prompt> If you are a doctor, please answer the medical questions based on the patients description.hello i had an lump under my armpit for about 2 days and it causes sometimes some kind of pressure or discomfort what could it be im a male and the lump is really high in my armpit is it a swollen lymph node i could only feel it when i put my hand behind my head thank you very much  <response>: Hi, dairy have gone through your question. I can understand your concern. You may have enlarged lymph node. It can be due to reactive hyperplasia, tuberculosis, lymphoma or metastatic carcinoma. You should go for fine needle aspiration cytology or biopsy of that lump. It will give you exact diagnosis. Then you should take treatment accordingly. Hope I have answered your question, if you have any doubts then contact me at bit.ly Chat Doctor. Thanks for using Chat Doctor. Wish you a very good health. 