Skin lesions borders

In erysipelas, low-grade fever and flulike illness are common prior to development of the lesion. The lesion is fiery red, raised above the level of surrounding skin, and has well-defined borders. 

A 19-year-old patient taking lithium therapy for bipolar I disorder developed a pityriasis rosea-like dermatitis, which resolved when valproic acid was substituted for lithium (403). The rash was defined as erythematous, sharply bordered oval and finely scaling lesions along skin cleavages on the trunk and proximal parts of the extremities. There was no evidence of a herald patch. 

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