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.
Lets analyze each situation. 1  Mucus too thick Infections can thicken mucus and often change its color from a normal white bubbly appearance to a yellow or green glob. 2  Most commonly a sinus infection can present as thick, yellow/green mucus that is making its way out of the sinuses and into your throat.