ditto to all of the above.
Speak with your chiro, as s/he knows your specific problem areas and should be able to make suggestions.
I am lucky ... while my chiro does not quilt/sew, she appreciates it as her Mom and Sis do. So she knows the potential problems and has helped me a lot.
While not solving the problem ... some relief can come via a tennis ball! Back yourself up to a wall, and set it in place and roll it around on the knotted area. I keep a couple in nylon knee highs, as that way I can put it in place, hold the end, and not be forever chasing it across the floor.
Works great on butt, back, shoulders, ITB, etc. Anywhere you can get it wedged in there and hit the troubled spots! And if you have someone else giving you a massage, and they can't get deep enough into the spots ... give them the tennis ball.
(NOTE ... I said, them giving YOU, the massage, and not the other way around!!!!!! :lol: )