Sounds to be in the area of the Tensor Fascia Lata, it connects your ITB to your Pelvis i think. Did you go over on the ankle? Even if it wasn't painful at the time the tension can be transferred all the way up the outside of your leg and damage the Tensor, i tore the collagen that attatches the tensor to the pelvis once- took 4 months of physio to sort it, play it careful JT.