<s>[INST] Hi, I have developed a lump under my arm just above my armpit, in the last few months. I have seen my doctor and he sent me for an ultrasound. The results were clear and the specialist did not seem to think there was anything there, although I can clearly see it and feel it. It is very soft and sometimes goes away for a few moments and returns. My arm it constantly tingling and the veins in my arm and hand seem to engorge more than normal. No one can tell me what it is. Can you help please? I have a job where lifting heavy tools everyday leaves my arm feeling strained. I am 28 female and small in size. Please help! [/INST] Welcome to Chat Doctor .1. Since ultrasound examination is negative.2. With symptoms of venous engorge you can get a venous Doppler study to rule out any curiosities or AV malformations. 3. I would think of any underlying medical conditions / systemic diseases might cause the lymph nodal enlargement.4. Treat the cause if you are known to anything.5. Try giving rest to weight lifting in your job, which could at least find out the cause (if reduces means something to do with the work related)Hope it helps you. Wish you a good health. Anything to ask ? Do not hesitate. Thank you. </s>