A month or so ago i had a knot come up in the middle of palm. i now have a second one...and what looks to possibly be a third forming. should this be a concern and what type of doctor should i see? thank you. knots on palm of hand?

Palmar fibromatosis: The palms of your hands are comprised (under the skin) of mostly tendons. It may be that you are seeing nodules on those tendons due to inflammation. Talk to your PCP for an examination and to discuss underlying causes of inflammation. Non treatment can result in difficulty moving fingers as the "knots" will not allow normal movement of the tendons withing their sheaths.