Sometimes people will touch themselves in the facial area, and depending on the context leading to a gesture, where on the face the person touches can be instructive in decoding the meaning.
Just like with all body language, we need to consider possible other logical explanations before ascribing specific meaning to a single gesture.
Touching the side of the nose is a telltail form of body language that is nearly always done unconsciously. If I touch the side of my nose when talking to you, it may just mean that I have an itchy nose at the moment. You need to consider that as one possible reason.
But, if I am a witness on the stand in a court room and the opposing lawyer asks me to confirm or deny I ever saw the bloody knife, if my finger goes to my nose as I deny ever seeing the knife…
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