Smallpox, one of history’s deadliest diseases, killed about 30% of those infected and left survivors scarred.

Caused by the variola virus, it spread easily and was often fatal. A turning point came when scientists developed

a vaccine using the related vaccinia virus. This live virus could not cause smallpox but trained the immune system to fight it.

The smallpox vaccine left a distinct scar, usually a round or oval mark on the upper arm. Unlike modern injections,

it was delivered with a bifurcated needle that repeatedly pricked the skin. The technique caused

a temporary injury, producing a scab that healed into a lasting mark. Recipients sometimes experienced fever,

soreness, or swollen lymph nodes, while rare cases involved allergic reactions or infections.

Routine vaccination in the United States ended in 1972 after smallpox was eradicated worldwide, making the vaccine scar a historical marker.

For those who wish to reduce its appearance, options include sunscreen, softening ointments, or professional treatments like dermabrasion.

More than just a mark, the scar symbolizes a global triumph in public health. It stands as a reminder

of science’s power to defeat one of humanity’s most lethal diseases and the enduring value of vaccines.