John F. Carpenter, D. M. D., M.a.g.d Blog The Difference Between Cold Sores and Canker Sores

Cold Sore (fever blister) Canker Sore (aphthous ulcer) I find patients are frequently confused by these lesions and often use these terms interchangeably. Canker Sores (recurrent aphthous ulcers) and Cold Sores (recurrent herpes labialis) are two different ailments and require different treatments. While these conditions are usually not serious, they are very common and painful. [...]