Insect-sting allergy is also known as hymenoptera venom allergy, mosquito allergy, or bee sting allergy. Hymenoptera venom allergy is specifically used to refer to a severe allergic reaction to wasp, hornet, or bee stings. Mosquito allergy is used when an individual has an allergic reaction to the proteins present in mosquito saliva, causing redness, swelling, and itching. Bee sting allergy is when an individual has an allergic reaction to bee venom. Regardless of the type, insect-sting allergies have the potential to be life-threatening and require immediate medical attention.