Thank you for your email. Have u been doing anything strenuous/ more than usual physical activity before the pain/ soreness started?
A lot of times it can be due to an overuse injury. Sometimes there are some other less common reasons like malalignment, or even a hypersensitive nerve. I would need to take a look at your foot and examine it, and we may also need further radiological imaging. Then we will know what we are dealing with, and can then institute the correct treatment for the problem.
If the foot is still persistently symptomatic, it would be prudent to contact an Orthopaedic surgeon, especially someone that manages a lot of foot and ankle problems.
Do let me know if there is something else I may be of help for.
Best regards
Dr Sean Ng
