The truth:
Not everyone who receives the BCG vaccine develops a visible scar. Some people heal with little or no mark at all. Others may have had the scar fade significantly over time.
The absence of a scar does not automatically mean a person was never vaccinated, just as having a scar doesn’t indicate stronger or weaker immunity.
Smallpox vaccine scar: Pictures, causes, and more
Misconception 4: “The scar means your immune system is weak or damaged”
Another fear is that the scar signals long-term harm to the immune system or ongoing vulnerability to illness.
The truth:
The BCG scar is not a sign of immune weakness. In fact, it represents a normal immune reaction to the vaccine. The body recognizes the weakened bacteria in the vaccine and mounts a localized response, which can leave a small mark.
In many cases, the vaccine has been associated with positive immune training, especially in early life. The scar itself has no negative effect on health.
Misconception 5: “It’s dangerous or something that should be removed”
Some people feel self-conscious about the scar and worry it might be unsafe, abnormal, or something that needs medical treatment.
The truth:
