<s>[INST] I have a lump in my arm pit and my arm has a tingling feeling almost like it is going to sleep. I need to know what kind of doctor to see. i have brought this up with my general doctor but they say it is nothing. if it is nothing then why is my arm tingling. it seems to be getting worse. [/INST] Hi ! Good evening. I am Chat Doctor answering your query. Whatever the lump might be from, the tingling sensation / numbness in your arm could be due to its pressure on the brachial plexus (nerves of arm and hand). If I were your family physician, I would refer you to a general surgeon, who after a local and general examination might consider a FNAC (fine needle aspiration cytology) to arrive at the origin of the lesion. I hope this information would help you in discussing with your family physician/treating doctor in further management of your problem. Please do not hesitate to ask in case of any further doubts. Thanks for choosing Chat Doctor to clear doubts on your health problems. I wish you an early recovery. Chat Doctor. </s>