Inflammation in the bursa at the rear of the heel is named Retrocalcaneal Bursitis. Repetitive tension or friction about the back of the heel results in the bursa to swell leading to heel pain and tenderness, swelling and ankle stiffness. Usually associated with Achilles Tendonitis and Haglunds Deformity.   Opportunity Triggers https://www.theorthopaedicandpainpractice.com/the-definitive-guide-to-diagnosing-and-treating-ankle-pain-in-singapore/