Do you know why some people have a small circle of scar on their left hand, at the top? This scar is due to vaccination for smallpox. This vaccine was used until 1970s. It included live Vaccinia virus which triggers an immune response that protects people by the variola virus that causes smallpox.
Once the vaccine has been applied, a bubble was formed and then a crust, and is treated within a few weeks. After all, a circular scar. Doctors used a bifurcated needle that was dipped into the Vaccinia solution.
Every time the needle penetrated the skin, it adds a small amount of vaccine that causes blisters…. Maybe that’s why the scars are pretty big.
What happens after vaccination?
A slight swelling occurs in the vaccinated place and lasts for 6 to 8 hours. Then the swelling diminishes. 6-8 weeks later, the swelling reappears, like a swelling of a mosquito bite. This swelling begins to grow and creates a nodule, which bursts and releases the liquid and creates an ulcer. Once the ulcer is healed, it remains a scar.
After the 70s.
In the Western countries, after 70 years, smallpox was eradicated, so it was no longer required, unless someone has traveled to the country where the virus still existed. In the 1980s, the variola virus was eradicated completely, and we no longer need a vaccine against smallpox.