Yellow-white blisters in the corners of the mouth and around the nose

Herpes simplex, also known as febrile blister, is a painful infection caused by the herpes simplex virus. It can occur throughout the body, but it is most common on the gums, outside the mouth, outside the tongue, nose, cheeks, or fingers. After the blisters are formed, the exudate is broken and the yellow-white crusts eventually fall off. Create new skin under the crust. The ulcer usually lasts 7 to 10 days.