First thing is take a foam roller and hit the IT band really well, when they tighten up, it will often feel like a slight "tearing" sharp pain in the upper thigh, right where youre description is located vag. Make sure quad mobility is good, simple heel to butt works fine.
If neither of those really help, you dont want to push it too hard. Take a few days off from training, stretch and foam roll, come back to it slowly. A minor strain can turn into a major one quickly if you dont give it time to heal. If it continues to bug you squatting, you can switch to a box squat for a while to give the quad a rest, while still keeping some training effect.
EDIT: I changed "thing" to "thigh", IM REALLY NOT FUCKING RETARDED IT WAS A LONG DAY.