Kissing and Allergies
In cases of extreme allergy a kiss from someone who has recently eaten the food you are allergic to can lead to severe reactions.
Monti et al describe the case of a child allergic to fish who reacted with facial urticaria and angioedema after a kiss.
Kiss-induced facial urticaria and angioedema in a child allergic to
fish.
Monti G, Bonfante G, Muratore MC, Peltran A, Oggero R, Silvestro L,
Mussa GC.
Allergy 2003;58(7):684-5.