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Zinnias are colorful, low-maintenance annuals that prefer warm weather and bright sunlight. Although zinnias are relatively disease-resistant, they are sometimes plagued by diseases that cause brown spots. The brown spots are usually caused by one of three types of leaf spot -- Alternaria leaf spot, bacterial leaf spot and Cercospora leaf spot.
There are many types of hyper-pigmentation, but the following 3 are the most probable causes for dark spots, brown spots and age spots to appear on the skin. 1  Sun Exposure: Darker pigment spots such as age spots are caused by sun exposure and harmful UV rays that produce excess melanin. When UV rays are deposited in the skin where it then triggers the melanin in your skin to over produce and leave dark spots and age spots on the skin.