Hello, I have recently noticed a dent in my shin, about six inches from the beginning of the ankle. I have experienced no trauma to the area, and been in no serious accidents. Even more interesting, I have a matching dent on the other leg, but it is less extreme - though neither are highly noticeable at a reasonable distance. Other than an injury that may have gone unnoticed, what could have caused this? Taking both possibilities into consideration (injury and otherwise), will the dent go away?