Causes of Lip Allergy, is caused by the contact, and repetitive contact of the lips with some unhygienic lip products. These included the lip balms, lipsticks, other moisturizing chemicals, foods with artificial color, and unhygienic food. Over dosage of medicine and frequent intake of the antibiotic medicine. Further this included the bee bites, of the mosquito bites, and other insects which feed ways towards your lips and causes them to get infected and allergy.