Sometimes the callous removing pads with salicylic acid work well. You can put one on for 48 hours then remove it and replace it with another if needed. Follow the directions on the box.
If this doesn't work you may want to see a podiatrist about having it removed. It can often be done in the office.
Advice and opinions given are based on the information provided and must not be considered an official medical recommendation. The limitations of the internet prevent an appropriate evaluation. Always consult your doctor if there is concern.