Haglund’s deformity is an enlarged piece of bone found posterior to the heel bone and is a painful issue commonly encountered by athletes. It can be difficult to manage. The larger portion of the heel bone friction against the footwear, leading to pain and blisters. This bursitis may be fairly swollen. https://runningone.net/how-to-deal-with-a-bony-bump-at-the-back-of-the-heel/