Adult onset urticaria pigmentosa: a case report

Urticaria pigmentosa is a fairly indolent form of cutaneous mastocytosis, which is more prevalent in infants than in adults. Adult onset disease is usually supposed to be associated with systemic disease and has a propensity for polycythemia vera and leukaemia in a certain percentage, though regression has been reported in as many as 19% cases. A useful clue to diagnose indolent forms from malignant forms is that invariably there is thrombocytopenia with leukocytosis in malignant forms. We report an adult female with typical lesions of urticaria pigmentosa, proven by skin biopsy, who showed a good response to H1 and H2 receptor blockage treatment