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The marks are easy to see because each time the needle was used, a small amount of the vaccine was injected, creating blisters. The place where the shot was given may get a little swollen for a short time, but it will go back to normal. However, after 6 to 8 weeks, a bump appears that looks like a mosquito bite and develops into a lump. Later on, it opens up, leaks liquid, and turns into a sore, which eventually heals and becomes a permanent scar.
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