Hi welcome to the health care magic Here without physical examination it is difficult to give one specific diagnosis Bursitis, tendinitis, plantar fascitis, ankle sprain, arthritis like causes has to be ruled out For that physical examination and local part x ray needs to be done .... For primary work up ESR also should be done Ibuprofen can be prescribed If inflammation or strain is the cause Avoid weight bearing on heel for prolonged duration Consult orthopedic surgeon for examination and accordingly further treatment plan Take care Hope your concern solved