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.
Oral Fungus Causes Common Mouth Infection. If you want to avoid or control a common infection called oral thrush, you've got one more reason to visit your dentist, especially if you have diabetes, wear dentures or have a problem with your immune system. Also called candidiasis, the fungal infection causes painful white spots on the tongue or inner cheeks. The lesions may bleed slightly when scraped or when you brush your teeth. Sometimes oral thrush spreads to the roof of the mouth, gums, tonsils or the back of the throat.