Dear Student
The bee - sting causes swelling, pain and irritation because it contains methanoic acid which causes these.
We can have a base over it as by Cleaning the area with soap and water, then apply hydrocortisone cream to the site to decrease the severity of the reaction. Alternative treatments include a paste made of unseasoned meat tenderiser and water (the enzyme in meat tenderiser can break down bee venom) or a paste of baking soda and water.
Regards