Chemotherapy, pipe and cigarette smoking, chewing tobacco and trauma to the lips; in addition to malignancy, allergic reactions, ulcers, pathogens and different medications can cause white stuff on the lips, according to Healthgrades. Pathogens and ulcers are the most common causes.
A pathogen is any bacterium or fungus that travels through the bloodstream. Ulcers, commonly known as canker sores, are cause by a contagious person to person contracted virus, explains eMedicineHealth. Allergic reactions is another major cause of these spots, which occur when the body is trying to push the rejected item out through the skin. If these spots do not go away or continue to pop up, it is important to notify a doctor.