Cold sores are common, and they can sometimes appear under the nose. Learn about the symptoms, causes, treatment, and prevention of cold sores under the nose.

Mouth ulcers, which include canker sores, are small sores that develop within the mouth. There are no definite causes of mouth ulcers, but some injuries, allergies, or sensitivities may trigger them.

Cold sores and angular cheilitis can look somewhat similar, but they’re two different conditions. Learn more.

Canker sores from Crohn’s might at first appear similar to other mouth lesions like cold sores, and they can both be painful. But cold sores have a different cause — herpes simplex virus type ...

Canker sores are painful ulcers that occur in the mouth, including on gums. Here's a look at how to deal with them.

"Love Island" contestant Nic Vansteenberghe is being criticized for having a cold sore on the show. But he doesn't deserve the shame. Here's what to know.

Cold sores are small blisters that usually appear around the mouth. Find out how long they last, the stages of healing, and treatments that may help.

Needless to say, the islanders are swapping spit more than college kids in Cancun on spring break, so a cold sore outbreak wasn’t just likely—it was kind of inevitable.

The cold sore-causing Herpes Simplex Virus (HSV-1) hijacks human cells and reconfigures its DNA within just an hour after infection, according to a new study that may help tackle the pathogen.

The cold sore-causing Herpes Simplex Virus (HSV-1) hijacks human cells and reconfigures its DNA within just an hour after infection, according to a new study that may help tackle the pathogen. Viruses ...