When a bee stings a person, it injects venom into the skin using its stinger.
This venom contains proteins that interact with skin cells and the immune system, leading to an immediate reaction.
The initial sensation is typically a sharp, burning pain caused both by the puncture of the stinger and the chemicals in the venom.
Right after the sting, the affected area often becomes red, swollen, and warm. These changes occur as the body quickly responds to the intrusion.