Q: Which part of the bodies are more prone to be "Red" in "Red Man Syndrome" secondary to IV Vancomycin?

Answer:  Face, Neck and Upper Torso 

"Red man syndrome" is a potential side effect that may occur with vancomycin administration. It is not a true allergic reaction and is probably related to the release of histamine.

It can be avoided with slowing  (over 2 hours) and diluting the infusion and with previous history or concern for any risk, pre-treatment with a histamine-1 antagonist prior to any further dose may help.