If you find a tiny black dot under a small area of hard skin on the sole of your foot, it’s likely to be a verruca.
This type of lesion will be slightly raised from the surface and will feel rough to touch. In some cases a verruca can be uncomfortable, and treatment will need to be sought as exposed verrucas can be contagious. If left untreated, the verruca may continue to grow, which can be aesthetically undesirable as well as becoming at risk of significant discomfort.