Question: what is a small white bump on the bottom of my foot?
Answer: Found on the bottom of feet, these ugly, painful bumps are caused by a type of human papillomavirus. That strange-looking bump on the bottom of your foot could be what's known as a plantar wart. Plantar warts, caused by a virus, strike the soles of the feet, may occur alone or in bunches, and can be quite painful.