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  It is possible to only have one descended testicle.  If I am not mistaken, an undescended testicle must be taken care of.  
 Is the knot in that area?  Or is it a bump you saw to the side of the base of the penis?  There are glands in that area that will pop out like a little marble on each side.
 
 It's hard to say without knowing where exactly the knot is.
 
				__________________ Kristin, Max and Teddy   |