Also called fever blisters, you don’t get cold sores from fevers or colds but they can be triggered by them. The virus that causes cold sores is usually passed via a kiss, shared utensils, or other close contact. Over-the-counter creams and ointments may help discomfort and speed healing. Frequent sores may require a prescription. Cold sores are a top mouth problem. Other problems include canker sores, TMJ, bad breath, and mouth cancer.
Caused by candida yeast, thrush is most common in older adults or babies. But a weakened immune system, antibiotics, diabetes, or certain medications — such as inhaled corticosteroids — can give candida a chance to grow wild. Wiping away the patches will cause soreness. See a doctor for a firm diagnosis.