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.
Thick saliva or mucus, White patches inside mouth, White patches on tongue. Pain or discomfort, Tenderness to touch, Thick saliva or mucus. Cough, Pain or discomfort, Thick saliva or mucus. Bad breath, Cough, Thick saliva or mucus.