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Toxicology – Toxins Causing Erythema
Carbon Monoxide
Carbon monoxide poisoning may produce the classic “cherry red” skin appearance, although this is a late and often postmortem finding rather than a reliable early clinical sign.
Cyanide
Cyanide toxicity can cause skin erythema due to elevated levels of oxygenated hemoglobin in the venous system. Additionally, hydroxocobalamin, a common antidote, can itself produce noticeable skin redness.
Chinese Restaurant Syndrome (MSG Reaction)
This condition is associated with ingestion of monosodium glutamate (MSG) and may present with flushing, chest discomfort, palpitations, headache, perioral tingling, facial swelling, and sweating.
Scombroid Poisoning
Scombroid poisoning results from ingestion of histamine-rich spoiled fish, leading to vasodilation and prominent skin flushing.
Anticholinergics
Erythema is a hallmark feature of anticholinergic toxicity, often described as “red as a beet” in the classic toxidrome.
Niacin
Niacin, commonly used to manage lipid levels, frequently causes flushing even at therapeutic doses. This effect can be reduced by taking aspirin beforehand or dosing at night.
Disulfiram Reaction
This reaction occurs when aldehyde dehydrogenase is inhibited by agents such as disulfiram, metronidazole, tolbutamide, or cefotetan. When alcohol is consumed, acetaldehyde accumulates, leading to flushing along with nausea, vomiting, tachycardia, shortness of breath, headache, and confusion.
Carbon Monoxide
Carbon monoxide poisoning may produce the classic “cherry red” skin appearance, although this is a late and often postmortem finding rather than a reliable early clinical sign.
Cyanide
Cyanide toxicity can cause skin erythema due to elevated levels of oxygenated hemoglobin in the venous system. Additionally, hydroxocobalamin, a common antidote, can itself produce noticeable skin redness.
Chinese Restaurant Syndrome (MSG Reaction)
This condition is associated with ingestion of monosodium glutamate (MSG) and may present with flushing, chest discomfort, palpitations, headache, perioral tingling, facial swelling, and sweating.
Scombroid Poisoning
Scombroid poisoning results from ingestion of histamine-rich spoiled fish, leading to vasodilation and prominent skin flushing.
Anticholinergics
Erythema is a hallmark feature of anticholinergic toxicity, often described as “red as a beet” in the classic toxidrome.
Niacin
Niacin, commonly used to manage lipid levels, frequently causes flushing even at therapeutic doses. This effect can be reduced by taking aspirin beforehand or dosing at night.
Disulfiram Reaction
This reaction occurs when aldehyde dehydrogenase is inhibited by agents such as disulfiram, metronidazole, tolbutamide, or cefotetan. When alcohol is consumed, acetaldehyde accumulates, leading to flushing along with nausea, vomiting, tachycardia, shortness of breath, headache, and confusion.
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