I agree with Ddaddy the IT band. I experience the same symptoms you have. Mine is the outer side of my thigh. I slowly run my fingers down from my hip towards the floor until I find the trigger point. You'll know when you find it. Take a baseball, tennis ball, or a couple fingers and start rubbing that spot. Yep it will hurt. Do it for 10-15 minutes and then ice for 20 minutes. Do it three times a day for a couple days and it will start to feel better. Other than that stretch. Google hip stretches and you'll see plenty to choose from.