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Figure 7. Palpable purpura can appear in many different patterns . This picture shows a denser distribution with a sharp demarcation caused by what is known as Koebner's Phenomenon (Minor trauma, such as the elastic band in one's sock, can cause such a pattern). In this case, the “trauma” was caused by the patient's shaving of her legs, leading to the eruption of purpura in the area of skin where the razor had passed.