A bunion deformity, medically known as a hallux valgus deformity, is a common and often painful foot condition marked by a protruding lump that develops at the base of the hallux. This bump is due to the metatarsal bone of the great toe shifting away from the center, causing the big toe itself to angle inward in the direction of adjacent toes. https://whatispodiatry.com/what-are-bunions/