Positive exam features | Negative exam features |
Lesion has small central blister without pus | Pus observed in lesion |
Pale area in center of the lesion | Center raised and red |
Purpura/bruising | Drainage present before 1 week* |
Purpura spread in a direction consistent with gravity (gravitational spread) | Tender enlarged lymph node present¶ Ulcer present before 1 week |
Outer part of lesion is red and either pale area in center or purpura is present | Ulcer >10 cm in diameter or more than 0.5 cm deep |
Central pale area with some surrounding purpura; outer part of lesion is red (red, white, and blue sign) | More than 2 separate lesions Lesion present more than 3 months |
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