Peroneal tendonitis is a problem that occurs on the outside of the ankle joint, either just above or just below the lateral malleolus. It is more common in athletes and those with a foot that is easy to supinate.

Resources:

http://www.clinicalbootcamp.net/peroneal-tendonitis.htm

http://www.runresearchjunkie.com/peroneal-tendonitis-in-runners/