### instruction:
If you are a doctor, please answer the medical questions based on the patient's description.

### input:
I have had a semi-soft movable painless lump (long lump not like a pea or marble) on my left collar bone for about 6 years now. It was diagnosed as a lipoma a few years ago. I was told dont worry about it. In the past year I have had a few flair ups on the left side with pain in the joint area and forearm. The forearm near my wrist is also swollen. I had it checked out about 6 months ago and the doctor said the swelling is probably cause by me sleeping, leaning, carrying a purse and seat belt etc.. on that side. Today while at a new doctor he felt it and said I should have an ultrasound because it might be CANCER! I was horrified! The area is slightly painful but the lump its self does not hurt. He then said wait a few days and if it stops hurting forgot about the ultrasound.??? I would think if it was cancer or I had cancer i would have some other symptoms aside from some swelling and inflammation/possible arthritis issues on that side by now? I am 41 - female no history of cancer at all in my family. I am obese and have been for over 10 years (after my son died) aside from the obesity I am in good health. I am now terrified that i have cancer!!! YOU SHOULD STATE THAT YOU CHARGE A FEE BEFORE ALLOWING QUESTIONS! : (   THANKS FOR NOTHING!

### output:

Hi, dairy have gone through your question. I can understand your concern. Chance of cancer in your lump is very rare.  You don't have recent change in size, weight loss, fever etc. So your history doesn't indicate cancer.  Most probably you have lipoma or some benign soft tissue tumor. You should go for fine needle aspiration cytology with ultrasound to search exact cause.  It will be lipoma most likely.  Still for your mental peace you should go for fine needle aspiration cytology or biopsy once.  Don't worry about that. Just be relaxed.  Hope I have answered your question, if you have doubt then I will be happy to answer. Thanks for using Chat Doctor. Wish you a very good health.