Redness of the skin or a rash resulting from toxic agents such as drugs.
Erythema resulting from the toxins of diseases such as scarlet fever, German measles, rheumatic fever, and drug reactions. One notable erythema within this category is erythema marginatum, characterized by red rings or patterns in conditions like rheumatic fever, rheumatic endocarditis, and chorea. Additionally, certain foods like strawberries, plums, and rhubarb, as well as medications such as arsenic, lead, mercury, sulphonamide, and quinine, can induce toxic erythema. Another type, known as x-ray erythema, is caused by radiodermatitis resulting from exposure to x-rays.