​Haglund's deformity is a bony enlargement on the back of the heel, specifically at the attachment of the Achilles tendon. This condition manifests as a prominent bump on the heel that can cause significant discomfort, particularly when wearing shoes. The protrusion is often due to excessive bone growth and irritation, which leads to inflammation of the surrounding soft tissues, including the bursa—a small fluid-filled sac that helps reduce friction.

Patients with Haglund's deformity typically experience pain and tenderness in the heel area, which can be exacerbated by the friction and pressure from shoes, especially those with rigid backs. The condition can lead to bursitis, where the bursa becomes inflamed and swollen, further intensifying discomfort. Over time, the continuous irritation can also contribute to the development of calluses and worsening of symptoms. Treatment often involves addressing the symptoms through modifications in footwear, use of orthotic devices, and anti-inflammatory medications. In more severe cases, surgical intervention may be required to remove the bony prominence and alleviate persistent pain.