A method of applying a topical preparation of at least one of a mast cell stabilizer, an antihistamine, and a leukotriene inhibitor is disclosed for prevention and / or treatment of oral allergy syndrome of the lips, including lip itchiness and / or swelling. For example, topical application of Cromolyn Sodium to the lips can be used to prevent and / or treat allergic reaction to consumption or other contact with raw fruits and / or raw vegetables. The topical administration can be performed by using applicator devices that apply at least one of a mast cell stabilizer and an antihistamine in the form of a liquid, or a gel, or a butter, or a wax-like solid, or a liposome suspension. Applicator devices can include at least one of: a roller, a brush, a sponge, a swab, a tube, a lipstick. The taste of the at least one of a mast cell stabilizer and an antihistamine can be masked by flavors.