As long as I can remember, I've had leg pains in the exact same spot, being my inner calf. As I've grown up though, it seems that it changes a bit. Its always the same spot, but it now start in one leg (typically my ankle), moves up it, then switches to the other side, down that side, to that ankle.
6 weeks to fully heal to be able to change the earring. cartilage piercings take longer to heal than some other piercings. 6- 12 months is standard. A year is not uncommon either. If you take it out even when it is fully healed and leave it out for too long the hole will close up and this can happen very quickly. http://en.wikipedia.org/wiki/Body_pierci...
If you take out your new earrings too quickly after getting your ears pierced, the holes will close up as your earlobes heal. You must leave your earrings in until the wounds are completely healed around them, which usually takes about six weeks. Piercings on other parts of the body also tend to take about six weeks to heal. To be sure, follow the advice of your doctor or a qualified piercer before removing any new piercing.