Causes of Haglund’s Deformity
The cause of a Haglund's deformity is continuous or frequent pressure on the back of the heel from shoes. The back of the heel bone is shaped differently on different people; those with a prominent bump are more likely to develop Haglund's deformity. The main symptom is pain at the back of the heel.
Over time, the soft tissues also usually thicken over the bony prominence, causing a protrusion and callus to form. The callus can thicken and become inflamed while wearing shoes.
Usually, the condition is obvious from the appearance of the back of the heel. X-rays may allow a doctor to see how the heel bone is shaped and to make sure there is no other cause for the heel pain; but no other tests are generally required.