If you grew up in Asia, Africa, Latin America, or parts of Eastern Europe, there’s a good chance you have a small, round scar on your upper arm. Many people notice it later in life and wonder where it came from. Some feel embarrassed by it. Others invent explanations because no one ever explained the truth.
That little scar has sparked decades of confusion. Below are five of the most common misconceptions about the round scar on the arm—and the real facts behind it.
Misconception 1: “It’s a skin disease or a childhood injury”
One of the most widespread beliefs is that the scar is the result of a skin condition, an infection, or an injury from childhood. Some people even assume it came from a burn or an untreated wound.
The truth:
In most cases, the round scar is not caused by a disease or accident. It is the result of the BCG vaccine, which is used to protect against tuberculosis (TB). The vaccine is typically given in infancy or early childhood, which is why most people don’t remember receiving it.
The scar forms as part of the body’s natural immune response, not because something went wrong.
Misconception 2: “Only people from poor or rural backgrounds have it”
This misconception carries a heavy social stigma. Some people believe the scar is a sign of poverty, poor hygiene, or lack of access to modern healthcare.
The truth:
The BCG vaccine was—and still is—part of national immunization programs in many countries, regardless of income level. Millions of children from all social classes received it, especially in regions where tuberculosis was once widespread.
Having the scar says nothing about a person’s background, education, or social status. It reflects public health policy, not personal circumstances.
Misconception 3: “If you don’t have the scar, you weren’t vaccinated”
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