What's the vaccine that leaves the scar on our arm?

If you have a small round scar on your arm, it is most likely that it has been caused by the tuberculosis vaccine (TB), known as the BCG (Bacillus Calmette-Guérin).This vaccine is widely used in many countries, especially in those where tuberculosis is endemic.TE MAY INTEREST: Authorizes the WHO first vaccine against simic smallpoxWhy does the BCG vaccine leave a scar?The reason why the BCG vaccine leaves a scar is because of the way it is admin…