Some effective cold sore treatments for kids includes baby Orajel and Anbesol. Parents can also place a cool wet cloth on the sore several times per day, as stated by WebMD.
When a child has a cold sore, parents should avoid giving him or her spicy foods along with those that contain acid. Baking soda mixed with water can also be used as a mouth rinse to soothe the pain.
Cold sores are a result of a viral infection, notes the Mayo Clinic. The blisters form around the mouth or lips and fill with fluid. Cold sores can be spread through close contact.