Yes. I had the same thing. It took about 6 months to get back to normal. almost that is. I can still feel a slight firmness in that spot. (about 15 months post op) This is where they inserted the heart lung machine tubes to keep you alive during surgery.
But 3 years seems a bit much although I doubt it is a cancerous growth. Good Luck.
-enkaynj. Edward LifeSciences Corp. Bovine Pericardial Tissue Heart Valve. Model#3300TFX Implanted on July 6, 2011 by Dr.Michael Mack, The Heart Hospital at Baylor Plano, TX.