Haglund’s syndrome will involve a distressing swelling of the inflamed retrocalcaneal bursa (a little fluid filled sac Found at the back of the heel), sometimes coupled with the degeneration with the fibers with the Achilles tendon specifically at its insertion in the heel bone (insertional tendinopathy on the Achilles tendon). https://www.theorthopaedicandpainpractice.com/what-are-spurs-on-the-foot/