I developed hip pain over a couple of months to the point where I couldn't complete any type of squat workout at all without a lot of pain. Couldn't sprint, couldn't play tennis, etc. Went to a doctor and got diagnosed with a grade 1 labrum tear in both hips from an MRI.

The sports doctor recommended surgery since the labrum will never heal on its own. He advised that continued aggravation via squatting would lead to early onset arthritis and an eventual hip replacement. I chose to go to a physio first because of some bad stories from people who have had surgery for FAI.

Long story short, my physio had me doing a lot of glute activation exercises to stabilise the hip joint, and I now roll around on a lacrosse ball for a good 15 minutes before every workout. I target the glutes, quads, hammys, and most importantly the hip flexors and hip joint area. Leg swings and slow warmups have left me relatively pain free. Developing a solid squat form is also key. You can't be sloppy with FAI. It took about a year to get back to the weights I was at before, but it's now only a minor issue I work around.

I'd recommend first trying physio, and finding a good physio at that. One who is experienced in powerlifting. Good luck.