Final answer:
The condition when the sesamoid bones of the foot become inflamed is known as sesamoiditis, which can result from excessive pressure and strain on the foot.
Step-by-step explanation:
The sesamoid bones of the foot can become inflamed, a painful condition known as sesamoiditis. Sesamoid bones are small, round bones that develop in tendons near joints. A common example of a sesamoid bone is the patella, also known as the kneecap. In the feet, sesamoid bones are found near the big toe and can become inflamed due to excessive pressure and strain, often from activities like running, ballet, and wearing high heels. Sesamoiditis is characterized by pain under the big toe or on the ball of the foot, especially during weight-bearing activities.