Слово встречается в следующем контексте:
Сold sores are triggered by a number of different things from exposure to the sun for a lengthy amount of time extreme cold stress and sometimes fever when you are sick
to prevent cold sores make sure you wear sunblock on your lips
most chapsticks contain sunblock
and when it is cold out make sure to keep your lips moist again you can use a chapstick

Заранее спасибо