eli5 Why do we get a red bump when bitten by an insect?

Question

eli5 Why do we get a red bump when bitten by an insect?

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Answer 1

İnsect bites.
Those cels sends a distress call.
“Help dude I’m dieing over here.”
Your bodies task force comes in and illiminates the threat.
That little part swells and heats up do to the heat of the battle. And the pus inside of it is the dead cells and such.