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No, but they do hurt.
Swelling can cause weight gain, but bruising does not. If you have both bruising and swelling along with weight gain, it could be due to the swelling, but you should probably go to your doctor to make sure nothing else is going on, since those are pretty vague symptoms and you don't want anything serious to be going on that you ignore.

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14y ago

What else can I help you with?