What the small round scar on your arm might indicate

two-pronged tool known as a bifurcated needle. Instead of one puncture, the skin was tapped multiple times in a small area. That technique caused a localized reaction that often followed a familiar pattern:

• A raised bump formed
• It developed into a blister
• The blister dried out and scabbed over
• After healing, a small round or slightly indented scar remained

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