Raynaud's phenomenon causes temporary decreased blood flow to the fingers, toes, and ears, and less often the tip of the nose. Raynaud's phenomenon usually occurs with exposure to cold temperatures when blood flow decreases in the fingers and toes. The skin in the area involved will first turn white because there is no blood in that area. Next, the skin may turn blue, and once the blood flows back the skin becomes purple or red. If Raynaud's is not treated, sores or ulcers may develop in the areas with the decreased blood flow. If the blood flow is decreased for a long time, the skin in the affected areas could turn black and die. Rarely, Raynaud's phenomenon affects organs inside the body.
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