Which of the following is a sign of a corn?

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A corn is a bruise of the sole tissue just inside the hoof wall from repeated pressure, typically at the toe. The best sign is a strong pain response when you apply hoof testers to the area over the suspected corn, because the injured sole tissue is sensitive to localized pressure. Bruising in the seat of the corn describes the lesion itself and may not always be visible, so relying on that alone isn’t as reliable as a positive hoof tester test. Lameness can occur with many hoof problems and isn’t specific to a corn, while white line separation points to issues with the hoof wall rather than the sole bruise. So, a positive reaction to hoof testers over the affected area most clearly indicates a corn.