While both are painful, canker sores are a totally different ball game from cold sores. Cold sores reside around the lips, while canker sores form on the delicate insides of the mouth. Why canker ...
Primary Stage Syphilis During the primary stage of syphilis, one or more smooth, hard sores—called a chancre—may develop at the site where the bacteria entered the body, such as the penis, mouth, ...