Small ‘ball’ on the arch… You are here: Orthoped > Podiatry & Foot Questions > Small ‘ball’ on the arch… admin 0 Comment Podiatry & Foot Questions I have what look like a small bump on the arch of my left foot. It is very painful to touch. Its like somehting is under the skin. Any ideas what this could be? Related PostsWhite bumps on heel of foot (1) Plantar fibroma, alcohol sclerosing agent (2) Lump on bottom of foot (1) Right Foot Swollen and Very painful (3) bumps on ball of foot and pain (1) pain in ankle (1)