A singular symptom is indicative of carbon monoxide poisoning directly. High levels of carboxyhemoglobin in the blood can cause the skin to develop a flushed, cherry-red color. However, it is rare for doctors to discover this symptom before a postmortem examination. Carbon monoxide poisoning of the degree that causes the red skin is usually fatal. If a person develops cherry-red skin and has a history of other symptoms that could result from carbon monoxide poisoning, it is a medical emergency that requires immediate treatment.
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