The reason why a bee sting swells is because the stinger residue irritates the skin and releases substances such as histamine, which can lead to redness and swelling of the skin, among other manifestations.
1. Bee stinger residue can irritate the skin and cause redness and swelling.
Most bee stings have stinger residue, which is a foreign substance that can irritate the local skin and cause redness and swelling.
2. Bee stings release histamine, dopamine and other substances to stimulate skin redness and swelling.
The release of histamine and other substances after stinging will lead to an increase in capillary permeability, resulting in a metamorphic reaction, stimulating redness and swelling of the surrounding tissues, and even pain, itching, and in severe cases, anaphylactic shock.
In short, bee stings need to go to the emergency department of the hospital in a timely manner, under the guidance of a professional doctor for diagnosis and treatment.