Protect your lips from the sun with a zinc oxide cream or lip balm with sunblock. If your lips become dry, apply a moisturizing cream. Apply a compress. A cold, damp cloth may ease symptoms and help remove crusting. Or try using a warm cloth on the blisters to ease pain. Rest and try pain relievers.

Symptoms of a cold sore infection include a painful blister, typically on one side of the lips. A person can also experience tingling and swelling. Once the blister forms, they can ooze fluid and then crust over. In children, the first cold sore that develops may cause the inside of the mouth to become very swollen and painful.

A lip pimple forms a raised red bump, which may have a whitehead or a blackhead in its center. A cold sore, which is a fluid-filled blister or cluster of blisters, typically starts out red and swollen. Within two to three days, it will start to ooze a clear or slightly yellow fluid, and after a week of its appearance, it’ll crust over and scab.

Fever blisters on the lips, also known as cold sores, are small, blister-like lesions. They may also form on the chin, cheeks, or in the nostrils, as well as the gums or the roof of the mouth. Fever blisters result from infection with a herpes simplex virus. Antiviral medications may help manage them.