collagen? or not to Collagen?

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I was thinking about getting collagen put in my lip. I had it a few years back after I had an accident and had surgery on my lip to repair it. The dr. put in collagen to make my lip appear with a normal looking fullness... but now it has worn off and I need to do something again. I have heard bad reports about collegan, but myself did not have a bad reaction. What if any, other options are out there for good results?