The patient was a 25-year-old woman who presented for treatment of a wart. During the examination, she was found to have vascular mottling, i.e., red macules surrounding areas of pallor, on her thighs and upper shins. The eruption was not painful and did not itch or burn. The patient thought the mottling had developed six months earlier, during a period of sub-freezing temperatures, but did not recall exactly how it had appeared. It had remained unchanged for at least four months.

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A 25-year-old woman complained of a reticulated macular brown eruption present on her thighs for several months. Evaluation by her internist had determined that her thyroid function, antinuclear antibodies, complete blood count, urinalysis, and SMA-7 were all normal. She gave a history of prolonged use of a laptop computer, which she propped up on her thighs. This had led to an asymptomatic erythematous eruption, which had resolved, leaving behind the brown pigmentation.