A member asked:

Wonder why booster shots leave a scar & r usually placed on the upper arm?

A doctor has provided 1 answer

Placement: Shots are given in the upper arm because it is a convenient place where there is a big muscle in which to inject. Shots do not scar, but a vaccination can. The reason that the upper arm was chosen was not only because of the placement of the muscle but that it is a convenient site and could be a standard site when searching to see if a person has been vaccinated.

Answered 8/10/2013

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