Inflammation on the bursa driving the heel is termed Retrocalcaneal Bursitis. Repetitive tension or friction about the again of your heel triggers the bursa to swell leading to heel pain and tenderness, swelling and ankle stiffness. Frequently connected to Achilles Tendonitis and Haglunds Deformity.   Swelling and redness of the ankle, https://www.theorthopaedicandpainpractice.com/the-definitive-guide-to-diagnosing-and-treating-ankle-pain-in-singapore/