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The best way to get out of this anxiety is to get the lump examined. A lump on the sternum could be a swollen lymph node, a lipoma (localized collection of fat), a neurofibroma (localized collection of nerve and fibrous tissue) or a scar tissue from a surgery (may be the melanoma surgery if it happened there).
A lump in the lower sternum that comes and goes is often due to acidity. It is normal to be scared after you had melanoma. So the wisest thing to do would be to get this lump examined.
Hope this helps. Please let me know if there is any thing else and do keep me posted. Take care!
Thank you so much for the post. I am going for my physical Thursday so will have her examine the lump. My husband says he has one too and it's part of the sternum, I never noticed it before so am not really certain. The melanoma surgery was on my lower right leg. A nightmare to say the least. Still a bit confused by the whole thing as they labeled it a Stage III, but they did the SNB and none were active, they were labeled benign nodes and also the margins were clear after quite a bit of tissue taken. To clear my mind of some horrible thing that may not be, I was told to possibly get a full body PET scan. I myself think it would put a bit of my mind at ease. It's horrible living with anxiety. Not many people understand and it's frustrating. Unless something horrible has happened in their life, they don't think of the things I do. I will let you know what the Dr. says. Thank you again.