Lately I've been doing inside squats and I've started having knee pain on the outside of my knees.
The volume I've been doing is really low. Probably no more than 30-40 reps in a week. I don't feel like I've been going lower than my knees can handle as I never felt pain or even strain when doing the exercise.
I can't know for sure that the inside squats have caused my knee pain, but it has started at the same time I've been doing them. Also, some would argue that it's an inherently dangerous exercise.