A bunionette deformity is an abnormal bony prominence, or bump, on the outer side at the base of the fifth toe (the "pinky toe") at the metatarsophalangeal joint (MTPJ). The bony prominence can start out small and painless but become larger and more painful over time. When bunionettes become larger, it usually is because of growth of the bony prominence, a curved shape to the fifth MTPJ, or splaying of the fifth metatarsal away from the fourth metatarsal. The condition is also known as a tailor's bunion.