Erythema Erythema marginatum 2024-07-12T10:19:08Z An erythematous (pink-red, depending on the skin color of the affected individual) macule that spreads peripherally and coalesces to form polycyclic or serpentine patches or plaques. Lesions occur in crops over days to weeks and are evanescent. The rate of migration is 2 to 12 mm over a period of a few hours. Erythema marginatum tends to affect the trunk more than the extremities and to not be accompanied by pruritus.