Look at the surface of the leaves. If your plant is indeed infested with spider mites, the leaves may have yellow blotches on them. When light falls on the leaves, you may see a silvered look or even streaks of bronze or silver.
Healthgrades Editorial Staff. White patches in the mouth are a common symptom of infection, inflammation, trauma, malignancy, and other underlying conditions and diseases. Mouth white patches result from pathogens, such as bacteria, viruses and fungi, which inflame the lining of the mouth causing swelling, redness, and ulcer formation.
What could this be? It could be the common and sometimes painful oral yeast infection known as thrush. Thrush causes creamy white or yellow patches to appear on the sides, roof, gums, lips, and tongue of a baby's mouth. It also can spread to the throat, tonsils, or esophagus. Thrush is most common in infants and toddlers.