If it isn't too big of an injury, and the previous one if it was similar seemed to have mostly healed, I would give it some time (a week or more) and be easy with the postures if you can still do them, and it should heal. I have overextended my lower back, knees, ankles, but only by a little, and it took more than a week for them to heal up completely. Having a general idea of where those limits are, I move into them much more gradually and with extra care, and stay back three steps from that level to be on the safe side.
Some injuries, if bad enough, never seem to heal completely, even if they happen at very young ages.
If it is a matter of not taking it gradually enough, or if it happened unexpectedly, in either case it says something about what you can do to minimize the chance of it recurring. Wish you a speedy recovery.