This could be related to the way tissue behaves under the stresses of scar tissue as healing progress. We must also not forget the effect of gravity as well as the effect of time that takes a toll on the elasticity of all living tissue. It is a fact that a result that looks good at the end of surgery may over time start to look less than good. Conversely sometimes a result that looks overcorrected may over time, with the help of gravity and tissue stretch, settle to a very nice result.