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.
Yeast Infection - Corners of Mouth Show Symptoms of Thrush. Yeast infection is also referred to as thrush and affects almost everyone at some point or the other. This infection affects areas where there is excessive moisture such as vagina, penis, palate and gums. When there is excessive amount of yeast in the mouth, this sort of infection occurs. When you are affected with this ailment, corners of mouth are covered with lesions, blisters or sores. There are four different types of infection of the mouth namely Thrush, Hyperplastic, Erythemalous and Angular Cheilitis.