Many older people have a small, round, sunken scar on their left arm, which often goes unnoticed or is mistaken for an ordinary mole. However, this mole has a long history and immense medical and social significance, representing one of the most important milestones in the global fight against disease.
This distinctive scar is from smallpox vaccination, one of the most widespread and effective vaccination campaigns in history. For several decades in the 20th century, millions of people worldwide were vaccinated to eradicate this infectious disease, which had claimed countless lives over the centuries. The vaccine, administered en masse in many countries until the late 1970s, left indelible marks due to the method of administration.
Unlike modern vaccines, which are usually administered with a single-needle syringe, the smallpox vaccine was given with a forked needle designed to make multiple punctures in the same area of skin, typically 10 to 15. This procedure caused a mild reaction in the area, which typically became inflamed and crusted over. Once healed, the area left a circular, depressed scar that, over time, became visible for an entire generation.
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