Thank you for your question regarding hardness two years after your biopolymer removal surgery. This is not an uncommon problem. Before surgery, the hardness in the buttock is due to foreign body reaction and the creation of scar around the injected biopolymer. Your body identifies the biopolymer as a foreign substance, creating an inflammatory response. After the inflammatory response marks the biopolymer as a foreign object, scar tissue is created. The scar tissue become thicker and thicker until the biopolymer is removed. When the biopolymer and associated scar tissue was removed, the foreign body reaction was minimized. However, there is surgical scar creation due to the nature of the surgery. This is much softer than foreign body reactions to buy a polymer. In time the score tissue associated with biopolymer removal should decrease. I would suggest you be more thoroughly worked up with an MRI to determine that there is no residual biopolymer. If there is confirmation that there is no more or very minimal biopolymer left in the buttock, you may want to consider periodic episodic steroids doses Thank you for your question regarding buttock hardness two years after biopolymer removal surgery.