Concept

Erythema

Summary
Erythema (from Greek 'red') is redness of the skin or mucous membranes, caused by hyperemia (increased blood flow) in superficial capillaries. It occurs with any skin injury, infection, or inflammation. Examples of erythema not associated with pathology include nervous blushes. Types
  • Erythema ab igne
  • Erythema chronicum migrans
  • Erythema induratum
  • Erythema infectiosum (or fifth disease)
  • Erythema marginatum
  • Erythema migrans
  • Erythema multiforme (EM)
  • Erythema nodosum
  • Erythema toxicum
  • Erythema elevatum diutinum
  • Erythema gyratum repens
  • Keratolytic winter erythema
  • Palmar erythema
Causes It can be caused by infection, massage, electrical treatment, acne medication, allergies, exercise, solar radiation (sunburn), photosensitization, acute radiation syndrome, mercury toxicity, blister agents, niacin administration, or waxing and tweezing of the hairs—any of which can cause the capillaries to dilate, resulting in redness. Erythema is a common side e
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