Many people who are considered to have prominent ears have had them since birth. They’re not considered a problem unless they impact on self-confidence as there isn’t any known effect on hearing or general health.
One of the main causes of sticky out ears is what’s called an underdeveloped antihelical fold. When you look into the ear, the outer part forms the shape of the letter ‘C’. Inside the ‘C’ shape, the cartilage looks like the letter ‘Y’. The bottom part of the ‘Y’ shape is the antihelix. People who don’t have this fold often have ears that stick out.
Another reason for sticky out or bat ears is excess cartilage in the concha area. This is the bowl-shaped part that pushes the ear away from the head. Some people with protruding ears may have both excess cartilage and an underdeveloped antihelical fold.
In addition, like all of our physical features, sticky out ears often run in families. They can, however, randomly appear in one member of a family.