Hi,
I am qualified acupuncturist - the redness caused around an acupuncture point when needled is 'Erythema', redness of the skin caused by increased blood flow in the superficial capillaries. It occurs with a skin injury which is essentially what the needle is causing as it punctures the skin. However, in traditional terms its interpreted as the Qi/Chi at that point starting to flow and move more easily.
Best wishes,
Gurm
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