唇疱疹，也称为发热性疱疹，是由于病毒感染而在嘴唇上出现的。

Cold ___sores, also known as fever ___blisters, appear on the lips due to a viral infection.

长时间跑步后，我的脚后跟磨出了几个水泡。

After running for a long time, I got several ___blisters on my heels.