Do you have swelling there? If so, it might be bursitis which I had on the ball of my foot, diagnosed at the hospital with a scan. Very painful.
As an experiment while waiting to see my doctor for further advice, I rubbed Rhus Tox & Ruta Cream into it every night while watching TV and by the time my appointment arrived, the pain was much less and the swelling almost disappeared, so my doctor told me to keep on doing what I was doing. It totally disappeared after another couple of weeks of the cream.
I buy Helios brand which I've found is the best, and have been using it on osteoarthritis in hands, hips, ankle, etc. since 2014. It keeps the pain at bay.