Dr. Youner: Women of color, as well as Asian women, may have hyperpigmented or dark spots on the plantar (bottom) side of their feet. This occurs due to a concentration of pigment in the area. It is usually a benign condition, like a freckle.
However, there are certain instances where the condition must be seen by a dermatologist or podiatrist. If the dark spot is elevated, uneven, blackish or bluish in color, spreading rapidly, or unevenly colored, you will want a medical professional to take a look and do a simple biopsy on the site. Freckles do not appear all that often on the soles of very light-complected women. When dark spots are there and they are new, they need to be seen.
Nail techs see way more feet bottoms than the average doctor. They should let the client know that there is a spot—many people are unaware of what is on the bottom of their feet it there is no pain involved.