Foot warts are usually on the soles of the feet and are called plantar warts. When plantar warts grow in clusters they are known as mosaic warts. Most plantar warts do not stick up because the pressure of walking flattens them and pushes them back into the skin. These warts often have black dots that are actually blood vessels. Plantar warts have a bad reputation because they can be painful, feeling like a stone in the shoe, and are often difficult to resolve.
Flat warts are smaller and smoother than other warts.
They tend to grow in great numbers - 20 to 100 at any one time. They can occur anywhere, but in children they are most common on the face. In adults they are often found in the beard area in men and on the legs in women. Irritation from shaving probably accounts for this. They tend to be small and flat but can be thin and tall.