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.
Candidiasis: Symptoms. Symptoms of candidiasis differ depending on the severity of the infection and the area of the body affected. Symptoms of a mouth yeast infection (oral thrush) include the development of yellow-white patchy lesions in the mouth and on the tongue. The sores are raised and may also appear in the throat as well. The patches may become sore and raw, and it may become painful and difficult to swallow. ...