# fever blister

> English word · Noun

## Definitions
1. A cold sore, an outbreak of vesicles caused by herpes simplex viral infection, especially when recurring during another illness that causes fever.

## Etymology
From fever + blister, likely for an association with fever or other illness.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/fever-blister