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Hi. How long has the knot been there and how large is it?
Besides the nausea, any abdominal pain?
And about any abdominal pain?
OK. In that area of the abdomen there are two possibilities--an umbilical hernia or a sebaceous cyst. Since I can't examine you I can't tell you which it is but you should have a doctor look at it.
As for the nausea, If you haven't been screened for an H pylori stomach infection you need that since if you have it a course of antibiotics will resolve it.
Let me know if you need any more information please
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