Plantar warts are harmless, although they can certainly be uncomfortable. Often mistaken for corns or calluses, foot warts cause thickened skin and bumps in the affected area. The way to tell you to have warts is that they’re:
Raised, flat, and flesh-colored
Rough along the surface
Well-defined with boundaries
Sometimes, plantar warts are more gray or brown than fleshy. They often also have a black pinpoint center, which indicates that there’s a vessel inside — a clear sign of warts. These foot warts can even cause sharp or burning pain, especially if they develop on weight-bearing areas, like the balls or heels of your feet.