Seedy toe and white line disease are two completely different conditions. Seedy toe is a focal defect that affects the sole-wall junction while White line disease is a diffuse defect that affects the inner part of the hoof wall.
Seedy toe is a focal defect of the hoof wall that appears as a localized swelling of the wall just proximal to the coronary band. The lesion has a distinct pattern of progression and is usually located at the medial side of the wall. Seedy toe is not a true disease but rather a manifestation of an underlying cause. The most common cause of seedy toe is a hematoma or seroma resulting from a trauma to the area.