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Hello from JustAnswer.
What did your doctor think was the cause of the lump?
Is this visible if you were to take a picture of the lump?
Since it is not visible, can you describe how the lump feels in more detail?
The size of the lump does not help to suggest what would be the cause of the lump. However, if when you say that it does not feel any different than when you first noticed it, you mean that it has remained the same size over the last few years, then there is no reason for you to be concerned about whether this is cancer.
There are many benign lumps that can occur under the skin that can be the size of a nickel, and the most common are a sebaceous cyst or a lipoma, a benign growth of fatty tissue. These benign lumps will commonly not get larger over a few years.
So, there is nothing about this lump that sounds worrisome for cancer.
If I can provide any clarification, please let me know.