Haglund's deformity can occur in one or both of the feet. If you are suffering from Haglund's deformity you will most likely have noticed a bony enlargement at the back of the heel. This inflammation is caused when the bursa, a fluid filled sac between the Achilles tendon and your heel bone, becomes irritated. Other signs of Haglund's deformity include pain where the Achilles tendon and the heel meet, swelling, and redness. Difficulty in wearing an enclosed shoe as well as pain after activity are also common symptoms. Conservative and or surgical intervention are options for treatment.