Hello,
The black patch on your foot that has been present for a year could be due to frictional melanosis, caused by repeated rubbing or pressure from footwear. Since it’s not causing irritation, pain, or itching, it’s likely harmless. Changing footwear to softer and more comfortable options may help prevent further darkening.
Next Steps
However, for an accurate diagnosis and potential treatment options, I recommend consulting a dermatologist. I am happy to assist you further through an online consultation if needed.