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I received my third booster shot on January 4th and I have a bump on my arm with significant redness. Is this normal?

It is normal to experience a bump and redness after receiving a vaccine, such as a booster shot. You can apply cold compresses or ice to the area to help reduce swelling. This reaction should improve over the next few days. However, if the redness increases, if you develop a fever, or if the redness and swelling return after initially decreasing, it would be best to consult with a doctor. Keep an eye on the area to ensure that the redness decreases by early next week.