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Mononucleosis
Infectious mononucleosis (mono) is often called the kissing disease. The virus that causes mono is transmitted through saliva, so you can get it through kissing, but you can also be exposed through a cough or sneeze, or by sharing a glass or food utensils with someone who has mono.
Cold Sores
These are formed around your lips and are known as blisters. They are caused by herpes simplex virus and can spread while kissing.
