Sometimes, a lip sore is caused by an allergic reaction or irritation from things you use every day. Common causes include cosmetics, dental products, and certain foods. For example, some people might get contact dermatitis, which causes redness and swelling, after using a new lip balm or toothpaste. The best way to deal with this is to figure out what’s causing the problem and stop using it. Switching to hypoallergenic products can help your lips heal.
Bacterial Infections
Bacterial infections, like impetigo, can also cause sores on the lips. Impetigo is known for its red sores that pop, ooze, and form a yellow-brown crust. It’s very contagious and usually needs antibiotics to clear up. Keeping your hands and face clean and avoiding contact with people who are infected can help stop the spread of these kinds of infections. If you think you might have a bacterial infection, it’s important to see a doctor for the right treatment.
