erythema, more or less diffuse redness of the skin due to concentration of an abnormally large amount of blood within the small vessels of the skin (hyperemia), as in burns. Erythema nodosum is often associated with systemic diseases such as tuberculosis and rheumatic fever. Tender, bright red, slightly elevated nodules develop along the shins. Erythema multiforme can have a number of causes, including viral and bacterial infection, chronic disease of the visceral organs, or allergic reactions to drugs.
Erythema is redness of the skin caused by capillary congestion.


It can be caused by infection, massage, electrical treatments, acne medication, allergies, exercise, solar radiation (sunburn), or waxing and plucking of the hairs -- any of which can cause the capillaries to dilate, resulting in redness. Erythema is a common side effect of radiotherapy treatment due to patient exposure to ionizing radiation.

In about 30-50% of cases, the cause of Erythema is unknown.

Associated conditions

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