A Bunion is a bump that appears on the joint of your big toe. It occurs when bones in the front part of your foot move from their place. It causes the tip of your big toe to get pulled toward smaller toes and forces the joint of your big toe to stick out. This condition is called bunion in big toe. The bunion can make skin sore and red. Wearing narrow and tight shoes may cause bunions or can make them worse. It can also develop due to the shape of your foot, a medical condition or a foot deformity.