<s>[INST] Below and behind my right ankle bone is swollen for over a month, without injury. Swelling wraps around behind my foot to below and behind inner ankle bone. sore, and caused limp when I walk. worst on outside and below right ankle. Please don t add me to mailing list other than answering this question! [/INST] Hello, Few questions for you, What is your age?  If you are past 40 then likely cause is retrocalcaneal bursitis. In this condition swelling behind ankle is due to increase in bone spike at attachment of tendoachillis. This leads to pain while walking and moving. I would like to do X-ray of right ankle lateral view to confirm diagnosis. Usual treatment is hot water fomentation, analgesics and crêpe bandage. Visit to orthopedic surgeon for detailed clinical examination is recommended.  Hope I have answered your query. Let me know if I can assist you further. </s>