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October 1925


Arch Derm Syphilol. 1925;12(4):573-590. doi:10.1001/archderm.1925.02370100112015

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Urticaria Pigmentosa. Presented by Dr. Howard Fox.  G. B., a boy, aged 3½ years, born of American parents, had suffered for three years from the eruption. It was present on the trunks and extremities, and consisted of relatively few light brownish macules averaging one-quarter inch (0.6 cm.) in diameter. According to the mother's statement, there had never been any change in the eruption since its onset, none of the lesions having disappeared so far as she was aware. There were no subjective symptoms. On friction, the lesions became somewhat reddened but not appreciably elevated. The patient had recently suffered from both scarlatina and varicella. He was a well nourished, apparently normal child. Histologic examination by Dr. J. Frank Fraser showed the presence of mast cells.

DISCUSSION  Dr. Highman: Referring to the question of the mast cells, unless one has a good quality of polychrome methylene blue these cells do not

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