I have had Juvederm before with no problems. This time when I was injected, I have a hard lump about an 1 inch long under in my nasolabial fold. I revisited my doctor after 2 weeks, she massaged it and did Carboxytherapy on it. It has now been 4 weeks and it's is still there. My doctor says she does not know why I have it. It doesn't hurt and is not noticeable. Why did this happen?