The flower on the arm is usually BCG vaccine, which is mainly used to prevent tuberculosis.
Usually the flower (scar) on the arm is left after BCG vaccination and has no adverse effect on the health of the organism. BCG is a common live bacterial vaccine in clinic, which is mainly made of attenuated Mycobacterium bovis type tuberculosis. Usually after BCG injection, it can stimulate the body to produce specific antibodies, so as to achieve the purpose of preventing tuberculosis.
The general population develops immunity 4 to 8 weeks after BCG injection and it can be maintained for 3 to 5 years. In some people, localized redness, swelling and infiltration of the skin can be seen after BCG vaccination, and a small number of people will have adverse reactions such as lymphadenitis and pimple-like scarring. People with tuberculosis, acute infectious diseases, severe malnutrition, eczema or other skin diseases should not receive BCG vaccination.
It is recommended that people in need of BCG vaccination should consult regular hospitals and stay in the hospital for a period of observation after vaccination, so as to deal with abnormalities in time and prevent accidents from occurring. After vaccination, skin care should be strengthened to avoid stimulation by friction with foreign objects.