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Here is a map showing the location of lymph nodes in the body: http://www.medicinenet.com/image-collection/lymph_nodes_picture/picture.htm The nodes that are within the chest area are too deep to feel.
I'm glad you are seeing your physician on Friday since any lump that stays around for more than a week or two needs to be checked out. Abdominal/unbilical hernias are more commonly found below or just around the belly button. Generally hiatal hernias aren't palpable either.
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All the best,