This is Dr. David
sounds like a tendon or ligament tear or strain or muscle tear.
you need to see a doctor for it and see if you need an ultrasound or MRI scan
you may benefit from muscle relaxers and physical therapy and stretching of that muscle to improve flexibility and strength and decrease pain.
massage therapy could help as well.
you may need to carry around a softer sitting cushion with you for a short time for now.
bengay creams could help on the area.
arnica creams like Traumeel on the area could help decrease pain for now.
let me know if you have other questions.
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