This fungal infection has many names, because it causes so many different problems. Red Blotch is also known as leaf blotch, measles, and red spot. This disease looks worse than it is. Red Blotch causes anything from small red spots to large brownish splotches that can disfigure the leaves, stems, and flowers of a plant. The good news is that blotch does little to harm the basic health of a plant. The outer leaves are affected first because this is where water tends to get on the plant. The lesions never go very deep and so the plant rarely needs to be treated. Remove all dead and decaying plant matter that serves as a breeding ground. Keep water off of the foliage, stems, & flowers; and provide good air circulation to prevent red blotch.