Why should you never puncture the posterior curvature of the heel when doing a skin puncture?

Puncturing the posterior curvature of the heel can damage underlying structures, such as nerves, blood vessels, and tendons, leading to complications like pain, infection, or impaired mobility. This area is also rich in sensitive tissue, making it prone to excessive bleeding and prolonged healing. For safety and to ensure accurate blood sampling, it's essential to puncture the heel in designated areas, typically the lateral or medial aspects, where the risk of injury is minimized.